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Articles indexed Friday November 1 2013

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• what is the responsibility of ngnix or apache in rails application?

  - by user2177410

  How rails applications actually work? Let's say we have nginx + passenger + Ubuntu, so my questions are: What is nginx actually doing? How does it transfer requests to the rails app? what is passenger responsible for? And what is rack? How actually rails app can work just on webrick without apache? Please dont give me answers like "nginx processes the requests"; I need something more, or may be you know the source where I can read about this.

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• Open Folder within ClearCase Remote Client using Windows Explorer

  - by sammy

  Is there a way to open the folder location of a file from within CCRC? While I know I can open/copy from directly within CCRC, it is often useful to work directly with the file from within Windows Explorer. I am looking for something like "open file location" or "open in windows explorer". The folder within CCRC does not appear to allow opening it directly as the double-mouse-click action just expands the tree listing. The path is listed/copyable within the "ClearCase Details" tab, but I am trying to take my laziness to a whole new level by being able to open the folder with a single click. Any ideas if this is a feature available and where I can find it? Thanks. Info: Rational ClearCase Remote Client 7.1.1 Windows 7

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• Issue accessing remote Infinispan mbeans

  - by user1960172

  I am able to access the Mbeans by local Jconsole but not able to access the MBEANS from a remote Host. My COnfiguration: <?xml version='1.0' encoding='UTF-8'?> <server xmlns="urn:jboss:domain:1.4"> <extensions> <extension module="org.infinispan.server.endpoint"/> <extension module="org.jboss.as.clustering.infinispan"/> <extension module="org.jboss.as.clustering.jgroups"/> <extension module="org.jboss.as.connector"/> <extension module="org.jboss.as.jdr"/> <extension module="org.jboss.as.jmx"/> <extension module="org.jboss.as.logging"/> <extension module="org.jboss.as.modcluster"/> <extension module="org.jboss.as.naming"/> <extension module="org.jboss.as.remoting"/> <extension module="org.jboss.as.security"/> <extension module="org.jboss.as.threads"/> <extension module="org.jboss.as.transactions"/> <extension module="org.jboss.as.web"/> </extensions> <management> <security-realms> <security-realm name="ManagementRealm"> <authentication> <local default-user="$local"/> <properties path="mgmt-users.properties" relative-to="jboss.server.config.dir"/> </authentication> </security-realm> <security-realm name="ApplicationRealm"> <authentication> <local default-user="$local" allowed-users="*"/> <properties path="application-users.properties" relative-to="jboss.server.config.dir"/> </authentication> </security-realm> </security-realms> <management-interfaces> <native-interface security-realm="ManagementRealm"> <socket-binding native="management-native"/> </native-interface> <http-interface security-realm="ManagementRealm"> <socket-binding http="management-http"/> </http-interface> </management-interfaces> </management> <profile> <subsystem xmlns="urn:jboss:domain:logging:1.2"> <console-handler name="CONSOLE"> <level name="INFO"/> <formatter> <pattern-formatter pattern="%K{level}%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/> </formatter> </console-handler> <periodic-rotating-file-handler name="FILE" autoflush="true"> <formatter> <pattern-formatter pattern="%d{HH:mm:ss,SSS} %-5p [%c] (%t) %s%E%n"/> </formatter> <file relative-to="jboss.server.log.dir" path="server.log"/> <suffix value=".yyyy-MM-dd"/> <append value="true"/> </periodic-rotating-file-handler> <logger category="com.arjuna"> <level name="WARN"/> </logger> <logger category="org.apache.tomcat.util.modeler"> <level name="WARN"/> </logger> <logger category="org.jboss.as.config"> <level name="DEBUG"/> </logger> <logger category="sun.rmi"> <level name="WARN"/> </logger> <logger category="jacorb"> <level name="WARN"/> </logger> <logger category="jacorb.config"> <level name="ERROR"/> </logger> <root-logger> <level name="INFO"/> <handlers> <handler name="CONSOLE"/> <handler name="FILE"/> </handlers> </root-logger> </subsystem> <subsystem xmlns="urn:infinispan:server:endpoint:6.0"> <hotrod-connector socket-binding="hotrod" cache-container="clustered"> <topology-state-transfer lazy-retrieval="false" lock-timeout="1000" replication-timeout="5000"/> </hotrod-connector> <memcached-connector socket-binding="memcached" cache-container="clustered"/> <!--<rest-connector virtual-server="default-host" cache-container="clustered" security-domain="other" auth-method="BASIC"/> --> <rest-connector virtual-server="default-host" cache-container="clustered" /> <websocket-connector socket-binding="websocket" cache-container="clustered"/> </subsystem> <subsystem xmlns="urn:jboss:domain:datasources:1.1"> <datasources/> </subsystem> <subsystem xmlns="urn:infinispan:server:core:5.3" default-cache-container="clustered"> <cache-container name="clustered" default-cache="default"> <transport executor="infinispan-transport" lock-timeout="60000"/> <distributed-cache name="default" mode="SYNC" segments="20" owners="2" remote-timeout="30000" start="EAGER"> <locking isolation="READ_COMMITTED" acquire-timeout="30000" concurrency-level="1000" striping="false"/> <transaction mode="NONE"/> </distributed-cache> <distributed-cache name="memcachedCache" mode="SYNC" segments="20" owners="2" remote-timeout="30000" start="EAGER"> <locking isolation="READ_COMMITTED" acquire-timeout="30000" concurrency-level="1000" striping="false"/> <transaction mode="NONE"/> </distributed-cache> <distributed-cache name="namedCache" mode="SYNC" start="EAGER"/> </cache-container> <cache-container name="security"/> </subsystem> <subsystem xmlns="urn:jboss:domain:jca:1.1"> <archive-validation enabled="true" fail-on-error="true" fail-on-warn="false"/> <bean-validation enabled="true"/> <default-workmanager> <short-running-threads> <core-threads count="50"/> <queue-length count="50"/> <max-threads count="50"/> <keepalive-time time="10" unit="seconds"/> </short-running-threads> <long-running-threads> <core-threads count="50"/> <queue-length count="50"/> <max-threads count="50"/> <keepalive-time time="10" unit="seconds"/> </long-running-threads> </default-workmanager> <cached-connection-manager/> </subsystem> <subsystem xmlns="urn:jboss:domain:jdr:1.0"/> <subsystem xmlns="urn:jboss:domain:jgroups:1.2" default-stack="${jboss.default.jgroups.stack:udp}"> <stack name="udp"> <transport type="UDP" socket-binding="jgroups-udp"/> <protocol type="PING"/> <protocol type="MERGE2"/> <protocol type="FD_SOCK" socket-binding="jgroups-udp-fd"/> <protocol type="FD_ALL"/> <protocol type="pbcast.NAKACK"/> <protocol type="UNICAST2"/> <protocol type="pbcast.STABLE"/> <protocol type="pbcast.GMS"/> <protocol type="UFC"/> <protocol type="MFC"/> <protocol type="FRAG2"/> <protocol type="RSVP"/> </stack> <stack name="tcp"> <transport type="TCP" socket-binding="jgroups-tcp"/> <!--<protocol type="MPING" socket-binding="jgroups-mping"/>--> <protocol type="TCPPING"> <property name="initial_hosts">10.32.50.53[7600],10.32.50.64[7600]</property> </protocol> <protocol type="MERGE2"/> <protocol type="FD_SOCK" socket-binding="jgroups-tcp-fd"/> <protocol type="FD"/> <protocol type="VERIFY_SUSPECT"/> <protocol type="pbcast.NAKACK"> <property name="use_mcast_xmit">false</property> </protocol> <protocol type="UNICAST2"/> <protocol type="pbcast.STABLE"/> <protocol type="pbcast.GMS"/> <protocol type="UFC"/> <protocol type="MFC"/> <protocol type="FRAG2"/> <protocol type="RSVP"/> </stack> </subsystem> <subsystem xmlns="urn:jboss:domain:jmx:1.1"> <show-model value="true"/> <remoting-connector use-management-endpoint="false"/> </subsystem> <subsystem xmlns="urn:jboss:domain:modcluster:1.1"> <mod-cluster-config advertise-socket="modcluster" connector="ajp" excluded-contexts="console"> <dynamic-load-provider> <load-metric type="busyness"/> </dynamic-load-provider> </mod-cluster-config> </subsystem> <subsystem xmlns="urn:jboss:domain:naming:1.2"/> <subsystem xmlns="urn:jboss:domain:remoting:1.1"> <connector name="remoting-connector" socket-binding="remoting" security-realm="ApplicationRealm"/> </subsystem> <subsystem xmlns="urn:jboss:domain:security:1.2"> <security-domains> <security-domain name="other" cache-type="infinispan"> <authentication> <login-module code="Remoting" flag="optional"> <module-option name="password-stacking" value="useFirstPass"/> </login-module> <login-module code="RealmUsersRoles" flag="required"> <module-option name="usersProperties" value="${jboss.server.config.dir}/application-users.properties"/> <module-option name="rolesProperties" value="${jboss.server.config.dir}/application-roles.properties"/> <module-option name="realm" value="ApplicationRealm"/> <module-option name="password-stacking" value="useFirstPass"/> </login-module> </authentication> </security-domain> <security-domain name="jboss-web-policy" cache-type="infinispan"> <authorization> <policy-module code="Delegating" flag="required"/> </authorization> </security-domain> </security-domains> </subsystem> <subsystem xmlns="urn:jboss:domain:threads:1.1"> <thread-factory name="infinispan-factory" group-name="infinispan" priority="5"/> <unbounded-queue-thread-pool name="infinispan-transport"> <max-threads count="25"/> <keepalive-time time="0" unit="milliseconds"/> <thread-factory name="infinispan-factory"/> </unbounded-queue-thread-pool> </subsystem> <subsystem xmlns="urn:jboss:domain:transactions:1.2"> <core-environment> <process-id> <uuid/> </process-id> </core-environment> <recovery-environment socket-binding="txn-recovery-environment" status-socket-binding="txn-status-manager"/> <coordinator-environment default-timeout="300"/> </subsystem> <subsystem xmlns="urn:jboss:domain:web:1.1" default-virtual-server="default-host" native="false"> <connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/> <connector name="ajp" protocol="AJP/1.3" scheme="http" socket-binding="ajp"/> <virtual-server name="default-host" enable-welcome-root="false"> <alias name="localhost"/> <alias name="example.com"/> </virtual-server> </subsystem> </profile> <interfaces> <interface name="management"> <inet-address value="${jboss.bind.address.management:10.32.222.111}"/> </interface> <interface name="public"> <inet-address value="${jboss.bind.address:10.32.222.111}"/> </interface> </interfaces> <socket-binding-group name="standard-sockets" default-interface="public" port-offset="${jboss.socket.binding.port-offset:0}"> <socket-binding name="management-native" interface="management" port="${jboss.management.native.port:9999}"/> <socket-binding name="management-http" interface="management" port="${jboss.management.http.port:9990}"/> <socket-binding name="management-https" interface="management" port="${jboss.management.https.port:9443}"/> <socket-binding name="ajp" port="8089"/> <socket-binding name="hotrod" port="11222"/> <socket-binding name="http" port="8080"/> <socket-binding name="https" port="8443"/> <socket-binding name="jgroups-mping" port="0" multicast-address="${jboss.default.multicast.address:234.99.54.14}" multicast-port="45700"/> <socket-binding name="jgroups-tcp" port="7600"/> <socket-binding name="jgroups-tcp-fd" port="57600"/> <socket-binding name="jgroups-udp" port="55200" multicast-address="${jboss.default.multicast.address:234.99.54.14}" multicast-port="45688"/> <socket-binding name="jgroups-udp-fd" port="54200"/> <socket-binding name="memcached" port="11211"/> <socket-binding name="modcluster" port="0" multicast-address="224.0.1.115" multicast-port="23364"/> <socket-binding name="remoting" port="4447"/> <socket-binding name="txn-recovery-environment" port="4712"/> <socket-binding name="txn-status-manager" port="4713"/> <socket-binding name="websocket" port="8181"/> </socket-binding-group> </server> Remote Process: service:jmx:remoting-jmx://10.32.222.111:4447 I added user to both management and application realm admin=2a0923285184943425d1f53ddd58ec7a test=2b1be81e1da41d4ea647bd82fc8c2bc9 But when i try to connect its says's: Connection failed: Retry When i use Remote process as:10.32.222.111:4447 on the sever it prompts a warning : 16:29:48,084 ERROR [org.jboss.remoting.remote.connection] (Remoting "djd7w4r1" read-1) JBREM000200: Remote connection failed: java.io.IOException: Received an invali d message length of -2140864253 Also disabled Remote authentication: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=12345 Still not able to connect. Any help will be highly appreciated . Thanks

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• Unable to Start Activity ComponentInfo when Starting a New Activity

  - by Timtim17

  {I know there's already a whole bunch of questions like this, but I can't see any problems that related to my program.} I have an Android App that is supposed to take a name from a EditText and put it in a TextView in another activity. It previously worked, but then I wanted it to start another activity if the EditText's value was equal to "ANDROID". However, now the app crashes whenever I try to start either activity. First Activity: package net.timtim17.dev.android.fun.nametag; import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final EditText et = (EditText) findViewById(R.id.editText1); Button submit = (Button) findViewById(R.id.button1); submit.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { String text = et.getText().toString(); if(text.equals("ANDROID")){ Intent android = new Intent(MainActivity.this, AndroidNameTag.class); startActivity(android); }else{ Intent intent = new Intent(MainActivity.this, NameTag.class); intent.putExtra("name", text); startActivity(intent); } } }); } } NameTag Activity: package net.timtim17.dev.android.fun.nametag; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class NameTag extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_tag); TextView tv = (TextView) findViewById(R.id.textView2); tv.setText(getIntent().getExtras().getString("name")); } } AndroidNameTag Activity: package net.timtim17.dev.android.fun.nametag; import android.app.Activity; import android.graphics.drawable.AnimationDrawable; import android.os.Bundle; import android.widget.ImageView; public class AndroidNameTag extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_android); ImageView iv = (ImageView) findViewById(R.id.imageView1); iv.setBackgroundResource(R.anim.animation); AnimationDrawable anim = (AnimationDrawable) iv.getBackground(); anim.start(); } } LogCat Error: 10-26 11:26:35.602: E/AndroidRuntime(2900): FATAL EXCEPTION: main 10-26 11:26:35.602: E/AndroidRuntime(2900): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.timtim17.dev.android.fun.nametag/net.timtim17.dev.android.fun.nametag.NameTag}: java.lang.NullPointerException 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread.access$600(ActivityThread.java:141) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.os.Handler.dispatchMessage(Handler.java:99) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.os.Looper.loop(Looper.java:137) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-26 11:26:35.602: E/AndroidRuntime(2900): at java.lang.reflect.Method.invokeNative(Native Method) 10-26 11:26:35.602: E/AndroidRuntime(2900): at java.lang.reflect.Method.invoke(Method.java:525) 10-26 11:26:35.602: E/AndroidRuntime(2900): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-26 11:26:35.602: E/AndroidRuntime(2900): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-26 11:26:35.602: E/AndroidRuntime(2900): at dalvik.system.NativeStart.main(Native Method) 10-26 11:26:35.602: E/AndroidRuntime(2900): Caused by: java.lang.NullPointerException 10-26 11:26:35.602: E/AndroidRuntime(2900): at net.timtim17.dev.android.fun.nametag.NameTag.onCreate(NameTag.java:15) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.Activity.performCreate(Activity.java:5133) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 10-26 11:26:35.602: E/AndroidRuntime(2900): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 10-26 11:26:35.602: E/AndroidRuntime(2900): ... 11 more MainActivity Layout: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <TextView android:id="@+id/textView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="16dp" android:text="@string/main_text" android:textAppearance="?android:attr/textAppearanceMedium" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="14dp" android:text="@string/submit_button" /> <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_alignTop="@+id/button1" android:ems="10" android:inputType="textPersonName" > <requestFocus /> </EditText>

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• Setting up Sendgrid using AWS

  - by user2793297

  I currently have a site where the data is hosted on Firebase and the static files are hosted on AWS (I registered my domain using NameCheap, but am routing to AWS using Route 53 and S3). I now want to use SendGrid to send emails, but they are saying that I need to set up an SMTP server. I can't find anywhere what the best way to do this is. Can I get suggestions please on the best solution? I want to use SendGrid to send transactional email such as "Welcome to the site!", "Forgot Password", etc.

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• Cron won't use msmtpd to send emails in case of failed cronjob

  - by Glister

  I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email functionality). msmtp is installed and configured. Have already symlinked /usr/{bin|sbin}/sendmail to /usr/bin/msmtpd. I can send email by using: echo "test" | mail -s "subject" [email protected] or by executing: echo "test" | /usr/sbin/sendmail Without the symlink (/usr/sbin/sendmail) cron will tell me that: (CRON) info (No MTA installed, discarding output) With the symlinks I get: (root) MAIL (mailed 1 byte of output; but got status 0x004e, #012) Can you suggest how to config the cron/msmtp pair? Thanks!

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• VMware vSphere cluster design for site redundancy

  - by Stefan Radovanovici

  I have a question about the best design for site redudancy when using vSphere clusters. A bit of background info about our situation first though. We are a medium-sized company with two main offices, located in different countries. Our networks are linked by a Layer2 150Mbps leased line which is currently underused. We have a variety of services running for internal use within the company, some on physycal servers and some on existing vSphere clusters. In our department we also run several services (almost all running under various forms of Linux) like NTP, Syslog, jump servers, monitoring servers and so on. We have now the requirement that those servers need to be redundant within each location (which they are not at the moment) and also site redudant (which they are to some extent, the servers are duplicated in the 2nd location with configurations kept in sync via various methods at the application layer). There is no SAN available for us, at least not something that we can use at the moment. Cost is also an issue. While we do have some budget available for this, we can't afford to buy SANs for both locations for example. I looked at the VSA feature and it seems that this could be something for us but I am unsure how to solve the site-redudancy requirement. At the moment for testing purposes I am setting up in a lab a vSphere 5 with VSA on two ESXi hosts. I am currently using the Essentials Plus kit with VSA license, which allows me to build a VSA cluster on up to 3 hosts, together with a vCenter license to manage them. The hosts each have two dual-port network cards and two 600GB drives, running in Raid1. Hardware-wise this will be enough for us to run the all the services we need as VMs and will provide redundandcy within the site. At the moment I see only two option to have site redundancy: build an identical VSA cluter in the second location and keep the various services sync'ed at application layer (database sync, rsync and so on). simply move one of the hosts from the existing cluster to the second location, basically having the VSA cluster span the 150Mbps link between the sites. I would very much prefer the second option but I am unsure how well it'll work, if it can work at all. Technically it should, we can span the needed VLANs across the leased line and have them available in the second location. The advantage would be that we don't need to worry at all about sync'ing databases and the like. But I have the feeling that the bandwidth will not be enough, I have no way of knowing how much traffic will the VSA cluster generate between the hosts. I realize that this will most likely depend on the individual usage of the VMs but still, I have no idea how VSA replicates data between the ESXi hosts. Are these my only options or can my goals be achieved in some other way ? Is there perhaps a way to have some sort of "cold stand by" cluster in the second location where the VMs would be sync'ed once per night from the main location ? The idea is that in case the first site becomes unavailable, we would be able to bring all those VMs online there. We would be ok with the data being 1 day old. Any answers are appreciated. Best regards, Stefan

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• Trouble getting OS fingerprinting to work in iptables

  - by user1197457

  Everyone, As I understand it, OSF has been merged with the Kernel since 2.6.before-my-kernel-version. Yet when I do something like this: iptables -I INPUT -j ACCEPT -p tcp -m osf --genre Linux --log 0 --ttl 2 and I get an error like: iptables: No chain/target/match by that name iptables -L Shows no rules because I did an iptables -F at one point. ALSO, the following command: cat /proc/net/ip_tables_matches Does not show "osf" on the list. A google doesn't seem to help. I've also installed iptables-devel in hopes I'd be able to load the osf module. Sadly I haven't been able to get that to work. Centos 6.4 minimal Any guidance?

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• heimdal error Decrypt integrity check failed for checksum type

  - by user880414

  when I try to authentication with heimdal-kdc ,I get this error in kdc log : (enctype aes256-cts-hmac-sha1-96) error Decrypt integrity check failed for checksum type hmac-sha1-96-aes256, key type aes256-cts-hmac-sha1-96 and authentication failed!!! but authentication with kinit is correct!! my kerb5.conf is [logging] default = FILE:/var/log/krb5libs.log kdc = FILE:/var/log/krb5kdc.log krb5 = FILE:/var/log/krb5.log [libdefaults] default_realm = AUTH.LANGHUA clockskew = 300 [realms] AUTH.LANGHUA = { kdc = AUTH.LANGHUA } [domain_realm] .langhua = AUTH.LANGHUA [kdc] and when add this line to krb5.conf (in kdc tag) require-preauth = no I get this error krb5_get_init_creds: Client have no reply key

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• Force RAID to read "exiled" disk?

  - by user197015

  We have a RAID 6 array (Infortrend EonStor DS S16F) that recently had two disks fail. Immediately prior to replacing these two disks, a third, good, disk was accidentally ejected from the array. After reinserting this disk it is marked as "exiled" by the array's firmware, and so even after replacing the two failed disks with new ones the array refuses to rebuild the logical volume and remains inaccessible. Since the temporarily-ejected disk is still functional and nothing has been written to the array since it was ejected, it seems that it should theoretically be possible to recover all the data on the array, but how can we convince the array to use the data from the "exiled" disk? Thanks for any help or advice you can offer.

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• Slow Write Speed on ESXi host

  - by Gregg Leventhal

  I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get slow write speeds in the guests so I checked out ESXTOP and I see 15MB/s write speed there on this host, which is comprable to the guests. What could be causing such horrible write speeds? Is RAID 5 really this slow to write??

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• Uninstall SQL Server 2005 Express after Demoting the DC

  - by Walter Aman

  A Windows Server 2003 SP2 hosting a now orphan installation of SQL 2005 Workgroup was pressed into service as a DC in a disaster recovery scenario. It has since been demoted. The server also hosts legacy apps for which we lack reinstallation resources; thus our desire to preserve it as close to intact as possible while removing the orphaned roles. All efforts to remove SQL 2005 thru Control Panel and ARPWrapper /remove fail with error 29528. Should I abandon this and leave the orphan SQL dormant, or is it reasonable to remove it post-demote?

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• Domain clients can't reach website with same name as domain

  - by Moses

  I know this is a very basic question but I need some help. I'm setting up a domain controller on Zentyal with the domain name example.com. But I need the domain users to be able to get to our company website with the same name (http://example.com) that's hosted out there on a third party's server. I know this has something to do with adding a DNS record, but I don't know what type. I would experiment, but I don't want to break the whole works!

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• Server periodically freezing - Help Stabilizing

  - by JonDog

  We run an asp.net/sql server data collection website with a hand full of clients dumping data in and running reports. We moved to a new server (specs below) and have had issues with it freezing and having to reboot it a dozen times over the pass six months. The hosting company has mentioned possible causes (listed below) but cant give a definite answer on what is going wrong. They have offered to reconfigure how ever I like. We have benefited from having a much faster system and really dont want to get rid of the ssd's unless they are the issue. Two possible setup changes that I've talked with them about are also listed below. Any suggestions on what maybe causing the freezing issue as well as suggestion on a new setup would be great. My main questions are: Do SSD generally have problems running the OS & SQL Server on the same RAID Array? and Are the new SSD's still unrefined enough to be running in a production environment? Thanks Current: Xeon Quad Core E3-1270 3.40 Ghz 16 GB DDR3-1333 ECC SDRAM First Hard Drive: 120GB Intel SSD Second Hard Drive: 120GB Intel SSD Third Hard Drive: 120GB Intel SSD Fourth Hard Drive: 120GB Intel SSD SAS 4 Port RAID Card Windows 2012 Standard Edition - 64 Bit MSSQL 2008 Web Edition Possible Causes: Running Sql Server & OS on same RAID Array OS Software Issues Using SSD's CPU Underpowered Not enough RAM Option 1 2x Xeon Quad Core E5-2603 1.80 GHz 16 GB DDR3-1333 ECC SDRAM 1 x 240GB Intel SSD - OS 3 x 1 TB SATA HDD (7200 RPM) - SQL Server SATA 4 Port RAID Card Windows 2012 Standard Edition - 64 Bit Option 2 Dell PowerEdge E3-1270v2 3.5GHz 4 Cores 16 GB DDR3-1600 UDIMM 4 x 128 GB Samsung 840 Pro SSD Add-in H200 (SAS/SATA Controller), 4 Hard Drives - RAID 10 Windows 2012 Standard Edition - 64 Bit

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• Why is RAM usage so high on an idle server? [duplicate]

  - by DeeDee

  This question already has an answer here: Why is Linux reporting “free” memory strangely? 2 answers I'm investigating a server used for scientific data analysis. It's running RHEL 6.4 It has almost 200GB of RAM. It's been running very slowly for users via SSH, and after some poking around I quickly noticed that the RAM usage was sky-high. What's odd is that even in an idle state it's still using a ton of RAM: I also looked via htop and I can't see that any running process is using more than 0.1% of the RAM. So I wonder what's going on? Right now the only user-initiated process running is an rsync between two NFS-mounted shares. I tried rebooting the server and it was much more responsive for a few minutes, but then memory usage shot up again. Is there any way I can pinpoint why memory usage is so high?

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• Windows Server 2008 R2 creating a multi-year client certificate using the IIS certsrv page while deploying SSTP VPN

  - by Warren P

  I am trying to follow instructions on Technet about deploying a Standard (non-enterprise) SSTP based VPN) that were originally written for Server 2008, but I am using Server 2008 R2, I have gotten as far as the part where it asks you to create a request a Server Authentication certificate. I have deployed IIS, and Active Directory Certificate Services, and chose "Standalone" and "Standard" (non-enterprise) Certificate Authority because I don't have an OID and don't think I should have to get one for a simple deployment of SSTP. The resulting certificates made by the Certification Authority "Issue" command, only have a 1 year period of validity, I want a multi-year certificate. At no point in this process is there any way to input this information unless it's through the Attributes text input area on the Advance Certificate Request page, which appears to be generated using an old ActiveX control, which means I can only do this using the workarounds in the article that I linked at the top, and only using Internet Explorer. Update:: It may be that this question is pointless since self-signed keys do not appear to work, when I try them, using Windows 8 as the VPN client. The problem is that the keys that are self-created by the technique shown here do not have any Certificate Revocation Server URLs and so you get an error "The revocation function was unable to check revocation", and the VPN connection fails.

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• Fatal error: Out of memory (allocated ...) (tried to allocate ... bytes) not due to memory_limit setting

  - by Lorenz Meyer

  Since a few days, I get the following error on my server: Fatal error: Out of memory (allocated 262144) (tried to allocate 393216 bytes) Usually this error is due to a memory consumption that is exceeding the configured memory_limit, but in my case there is no relation. The memory_limit is set to 128MB, and in this case, we not even reach 1MB. Also the server does not have a big load, in fact it is an intranet server, and there are just a few people conected to it. System: Windows Server 2003, 1Go RAM, only 600 MB used. Apache 2.2.4 PHP 5.2.3 This error is appearing randomly. The memory limit reached also is randomly between a few kB to a few MB. Sometimes restarting Apache is required to get rid of the error, sometimes it disapears itself. Restarting Apache or the entire server helps temporarily. Where could this problem come from ? How could I narrow down the error source ?

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• htaccess filesMatch exclusion

  - by Hikari

  I have the following directive in my htaccess <filesMatch "\.(gif|jpe?g|png|js|css|swf|php|ico|txt|pdf|xml|html?)$"> FileETag None <ifModule mod_headers.c> Header unset ETag Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate" Header set Pragma "no-cache" Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT" </ifModule> </filesMatch> I copied that regex from someplace in Web months ago. It should add those headers to any HTTP Response that does NOT have those extensions. But it's not working, it's adding them to any Response. I also need to create another directive to add Header set Cache-Control "max-age=3600, public" to Responses of files that DOES have them. Could anybody help me make proper fileMatch regexes?

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• Strange performance issue with Dell R7610 and LSI 2208 RAID controller

  - by GregC

  Connecting controller to any of the three PCIe x16 slots yield choppy read performance around 750 MB/sec Lowly PCIe x4 slot yields steady 1.2 GB/sec read Given same files, same Windows Server 2008 R2 OS, same RAID6 24-disk Seagate ES.2 3TB array on LSI 9286-8e, same Dell R7610 Precision Workstation with A03 BIOS, same W5000 graphics card (no other cards), same settings etc. I see super-low CPU utilization in both cases. SiSoft Sandra reports x8 at 5GT/sec in x16 slot, and x4 at 5GT/sec in x4 slot, as expected. I'd like to be able to rely on the sheer speed of x16 slots. What gives? What can I try? Any ideas? Please assist Cross-posted from http://en.community.dell.com/support-forums/desktop/f/3514/t/19526990.aspx Follow-up information We did some more performance testing with reading from 8 SSDs, connected directly (without an expander chip). This means that both SAS cables were utilized. We saw nearly double performance, but it varied from run to run: {2.0, 1.8, 1.6, and 1.4 GB/sec were observed, then performance jumped back up to 2.0}. The SSD RAID0 tests were conducted in a x16 PCIe slot, all other variables kept the same. It seems to me that we were getting double the performance of HDD-based RAID6 array. Just for reference: maximum possible read burst speed over single channel of SAS 6Gb/sec is 570 MB/sec due to 8b/10b encoding and protocol limitations (SAS cable provides four such channels).

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• How to address a recurring low temperature error seen at every boot-up?

  - by GregC

  After updating to latest controller firmware, I started receiving the following error messages: LSI 2208 ROC: Temperature sensor below error threshold on enclosure 1 Sensors 5 thru 7 Is this something I should worry about, or is it a Red Herring? Details: I have a Sans Digital NexentaSTOR 24-disk JBOD enclosure connected to LSI 9286-8e RAID-on-Chip controller with two SAS cables. Seagate ES.2 3TB SAS hard drives populate every bay in the enclosure.

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• How to verify power provided to processors is clean

  - by GregC

  Once in a blue moon, I am seeing a blue screen of death on a shiny new Dell R7610 with a single 1100 Watt Dell-provided power supply on a beefy UPS. BCode is 101 (A clock interrupt was not received...), which some say is caused by under-volting a CPU. Naturally, I would have to contact Dell support, and their natural reaction would be to replace a motherboard, a power supply, or CPU, or a mixture of the above components. In synthetic benchmarks, system memory and CPU, as well as graphics memory and CPU perform admirably, staying up for hours and days. My questions are: Is power supply good enough for the application? Does it provide clean enough power to VRMs on the motherboard? Are VRMs good enough for dual Xeon E5-2665? Does C-states logic work correctly? Is there sufficient current provided to PCIe peripherals, such as disk controllers? P.S. Recently, I've gone through the ordeal with HP. They were nice and professional about it, but root cause was not established, and the HP machine still is less than 100%, giving me a blue screen of death once in a couple of months. Here's what quick web-searching turns up: http://www.sevenforums.com/bsod-help-support/35427-win-7-clock-interrupt-bsod-101-error.html#post356791 It appears Dell has addressed the above issue by clocking PCIe bus down to 5GT/sec in A03 BIOS. My disk controllers support PCIe 3.0, meaning that I would have to re-validate stability. Early testing shows improvements. Further testing shows significant decrease in performance on each of the x16 slots with Dell R7610 with A03 BIOS. But now it's running stable. HP machine has received a microcode update in September 2013 SUM (July BIOS) that makes it stable.

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• How does one remove an encryption type from a kerberos principal?

  - by 84104

  I would like to remove all of the des keys from the principal below, but have no idea how to do so without someone inputting the password. kadmin: getprinc user Principal: [email protected] Expiration date: [never] Last password change: Thu May 26 08:52:51 PDT 2013 Password expiration date: [none] Maximum ticket life: 0 days 12:00:00 Maximum renewable life: 7 days 00:00:00 Last modified: Tue Jul 16 15:17:18 PDT 2013 (administrator/[email protected]) Last successful authentication: Wed Jul 24 14:40:53 PDT 2013 Last failed authentication: [never] Failed password attempts: 0 Number of keys: 8 Key: vno 3, aes256-cts-hmac-sha1-96, no salt Key: vno 3, arcfour-hmac, no salt Key: vno 3, des3-cbc-sha1, no salt Key: vno 3, des-cbc-crc, no salt Key: vno 3, des-cbc-md5, no salt Key: vno 3, des-cbc-md5, Version 5 - No Realm Key: vno 3, des-cbc-md5, Version 5 - Realm Only Key: vno 3, des-cbc-md5, AFS version 3 MKey: vno 2 Attributes: REQUIRES_PRE_AUTH Policy: [none] Also, the the kdc is using an OpenLDAP backend.

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• Advised auditing method for MS SQL to track changes made to a specific table by a specific user?

  - by scape

  What is the best method for tracking changes or logging the queries done to a table by a specific user when the person is using Management Studio? I'm using 2008 R2 Express Edition and want to specifically track a single user who logs in through Management studio and runs queries to make changes manually. I want to see what query was run and thus determine what was changed and how. I am not interested in restoring the information. I considered Change Tracking but read that it is not ideal for auditing as well I am unsure how to read the data, then I considered the Bulk-Logging option on the database however I then have to consider handling the log files which may grow huge as the database is used constantly by a web app. I am wondering if there is a more concise method to do what I want?

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• Uncorrectable machine check

  - by GregC

  I am experiencing rare but real unrecoverable machine checks on HP DL370 G6 dual-core Xeon server. I ran memtest86+ before, and ran CPU-intensive operations without any problems. In your opinion, does this indicate a real problem, or is it normal and expected behavior? How would you approach this problem? EDIT after some troubleshooting, it seems that these machine checks, as well as problems when showing device manager can be traced back to NC375i NICs. All is well when the NICs are not in the server. Further improvements to stability of HP Gen6 with Intel Xeon have been brought in with BIOS update in September 2013 HP Update DVD. Intel's newer microcode makes these CPUs much more stable. We haven't seen hardware-related BSODs since the update in September.

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• Setting up Virtual Host in Fedora Core 15 using apache

  - by Roland

  I'm trying to setup a couple of Virtual Host files on my Localhost PC running Fedora Core 15. Now I get this working, but now onloy one Virtual Host site works, and if I type in 127.0.0.1/test/testApp.php which is not related to the Virtual Host site , I get redirected to the Virtual Host site. Here's what I did. I created a new folder called virtualhosts in /etc/httpd/ where all my host files are stored in the following format site.conf In /etc/conf/httpd.conf I enabled NameVirtualHost *:80 and included the host files at the bottom of the config page like this Include virtualhosts/*.conf In /etc/hosts I added the line 127.0.0.1 website No when I run sudo httpd -t I get Syntax OK I restart apache and then the Virtualhost works, but as soon as I add other hosts and only use 127.0.0.1 as above it still links to the original host. Am I doing anything wrong here or left out something? An example of my Virtual Host file looks like this <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/html/website/ ServerName website ServerAlias website ErrorLog logs/dev-error_log CustomLog logs/dev-access_log common Alias /blog /var/www/html/blog/ <Directory /var/www/html/website/> Options FollowSymLinks Allow Override All Order allow,deny allow from all </Directory> #php_value error_reporting E_ALL & ~E_NOTICE & ~E_DEPRECATED php_flag display_errors On php_value date.timezone Europe/London </VirtualHost>

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