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• big cpu load on vmware server / linux

  - by dezfafara

  Hi, I currently using a server 2.x hosting 4 virtual machines on a linux system Today, on my physical server, I saw an enormous load average: this is the "top" of the server, illustrating my 4 virtual guests. top - 11:02:02 up 194 days, 23:09, 5 users, load average: 18.78, 12.05, 13.55 Tasks: 113 total, 4 running, 109 sleeping, 0 stopped, 0 zombie Cpu0 : 71.6%us, 19.0%sy, 0.0%ni, 8.8%id, 0.0%wa, 0.3%hi, 0.3%si, 0.0%st Cpu1 : 74.3%us, 10.4%sy, 0.0%ni, 15.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 72.5%us, 17.6%sy, 0.0%ni, 9.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 79.5%us, 4.6%sy, 0.0%ni, 16.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8178884k total, 8129980k used, 48904k free, 134904k buffers Swap: 10490436k total, 148k used, 10490288k free, 6129728k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7312 root 6 -10 1149m 921m 559m R 97 11.5 107947:09 vmware-vmx 6995 root 6 -10 779m 687m 317m R 92 8.6 107374:31 vmware-vmx 6693 root 6 -10 880m 659m 409m S 85 8.3 76947:33 vmware-vmx 12937 root 6 -10 960m 719m 523m S 75 9.0 67219:49 vmware-vmx In bold are the cpu usage for my 4 virtuals guests These guests are running on a linux system, and the appropriate process are usually 5% - 15% of cpu I don't understang why , since a few days I have this big problem. This is the "top" on a virtual guest which is at 95% of cpu load top - 11:23:15 up 194 days, 23:13, 4 users, load average: 0.25, 0.47, 0.59 Tasks: 92 total, 2 running, 90 sleeping, 0 stopped, 0 zombie Cpu(s): 1.4%us, 7.7%sy, 0.0%ni, 90.5%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 382296k total, 369732k used, 12564k free, 145156k buffers Swap: 979924k total, 13956k used, 965968k free, 86988k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3691 root 20 0 23948 1148 960 S 13.0 0.3 15339:23 vmware-guestd 3840 root 20 0 19880 584 512 S 7.7 0.2 1729:17 hald-addon-stor This virtual guest state is ok ... If anyone has any ideas .. Thanks

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• Cant access folder on server- Permission denied

  - by Michal Korzeniowski

  I am running a vps with ubuntu 11.04. After a clean Modx install I've tried to access http://www.encepence.pl/manager and I've got a permission denied by my server. the thing is that I can easily access any other folder under that domain and modify this folder(manager) content via ftp. I’ve tried modifying virtual host with that <Directory /var/www/blackflow/data/www/encepence.pl/manager/> Options Indexes FollowSymLinks ExecCGI AllowOverride All Order allow,deny Allow from all </Directory> But it didn't work. <Directory /var/www/blackflow/data/www/encepence.pl> Options -ExecCGI -Includes php_admin_value open_basedir "/var/www/blackflow/data:." php_admin_flag engine on </Directory> <VirtualHost 192.166.219.34:80 > ServerName encepence.pl CustomLog /var/www/httpd-logs/encepence.pl.access.log combined DocumentRoot /var/www/blackflow/data/www/encepence.pl ErrorLog /var/www/httpd-logs/encepence.pl.error.log ServerAdmin [email protected] ServerAlias www.encepence.pl SuexecUserGroup blackflow blackflow AddType application/x-httpd-php .php .php3 .php4 .php5 .phtml AddType application/x-httpd-php-source .phps php_admin_value open_basedir "/var/www/blackflow/data:." php_admin_value sendmail_path "/usr/sbin/sendmail -t -i -f [email protected]" php_admin_value upload_tmp_dir "/var/www/blackflow/data/mod-tmp" php_admin_value session.save_path "/var/www/blackflow/data/mod-tmp" VirtualDocumentRoot /var/www/blackflow/data/www/%0 </VirtualHost> Any ideas on what might have gone wrong?

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• How do I set up an email server that automatically maintains a list of previous recipients?

  - by hsivonen

  I want to set up an email server with the following characteristics. What software (besides bogofilter and clamav that I'm naming) should I use and what HOWTOs should I read? The server should run some flavor of Linux that's as low-maintenance as possible and self-updates for security patches in a timely fashion. (Debian stable?) When email is sent, all the recipients are stored in the list of previous recipients maintained by the server. Scan incoming messages with clamav and treat as spam if it contains viruses. When email arrives (if it passed clamav), if the sender is on the list of previous recipients, bypass spam filter. If the List-Id header names a mailing list on a manually maintained list of known-clean mailing lists, bypass spam filter and deliver into a mailbox depending on the mailing list name. Email that wasn't from previous recipients, manually white listed domains or mailing lists gets filtered by bogofilter. Spam goes into a spam mailbox. Email considered to be ham should automatically be fed to bogofilter training as ham. Email considered to be spam (incl. messages with viruses) should be automatically fed to bogofilter training as spam. There should be mailboxes for false ham and false spam that an IMAP client can move email into so that the server retrains bogofilter appropriately. Email sending requires SMTP over SSL. Email reading requires IMAPS. Should I also want to use SpamAssassin in addition to bogofilter?

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• Setting up SSL on JBoss 5

  - by socal_javaguy

  How can I enable SSL on JBoss 5 on a Linux (Red Hat - Fedora 8) box? What I've done so far is: (1) Create a test keystore. (2) Placed the newly generated server.keystore in $JBOSS_HOME/server/default/conf (3) Make the following change in the server.xml in $JBOSS_HOME/server/default/deploy/jbossweb.sar to include this: <!-- SSL/TLS Connector configuration using the admin devl guide keystore --> <Connector protocol="HTTP/1.1" SSLEnabled="true" port="8443" address="${jboss.bind.address}" scheme="https" secure="true" clientAuth="false" keystoreFile="${jboss.server.home.dir}/conf/server.keystore" keystorePass="mypassword" sslProtocol = "TLS" /> (4) The problem is that when JBoss starts it logs this exception (during start-up) (but I am still able to view everything under http://localhost:8080/): 03:59:54,780 ERROR [Http11Protocol] Error initializing endpoint java.io.IOException: Cannot recover key at org.apache.tomcat.util.net.jsse.JSSESocketFactory.init(JSSESocketFactory.java:456) at org.apache.tomcat.util.net.jsse.JSSESocketFactory.createSocket(JSSESocketFactory.java:139) at org.apache.tomcat.util.net.JIoEndpoint.init(JIoEndpoint.java:498) at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:175) at org.apache.catalina.connector.Connector.initialize(Connector.java:1029) at org.apache.catalina.core.StandardService.initialize(StandardService.java:683) at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:821) at org.jboss.web.tomcat.service.deployers.TomcatService.startService(TomcatService.java:313) I do know that's there's more to be done to enable full SSL client authentication....

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• Apache2 Re-Routing from Domain Name to Internal IP Address

  - by Richard Grey

  The problem that I am having, is that when someone goes to my domain name example.co.uk, for some reason, apache seems to be re-routing the request to the internal IP address of the server, i.e. 192.168.0.52 My Apache2 default sites enabled file is as follows: ServerAdmin [email protected] ServerName trusteeguard.co.uk ServerAlias www.trusteeguard.co.uk DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride All </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride All Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/trusteeguard-error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/trusteeguard-access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride All Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> This is an Ubuntu box if that is any help ;)

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• Does MySQL have some kind of DoS protection or per-user query limit?

  - by Ghostrider

  I'm a bit at a loss. I'm running a MySQL database that's roughly 1GB data in indices combined on a dedicated Linux server. DB version is '5.0.89-community'. Configuration is controlled via cPanel. PHP actually runs elsewhere on a shared hosting. IP addresses are static and don't change. Access from remote IP address is properly configured. Website gets around 10K hits per day with each hit generating a a database query. Some of these queries are expensive (~1 sec execution time). All is fine and well until at some point DB server starts refusing connections from the client, claiming that specific user can't access the server from that IP. Resetting the server will always fix the problem for a day or two and then the same thing happens. There are some other DBs on that server, some of which are hit pretty hard on occasion but constantnly. One of the apps maintains several persistent connections since it does couple of updates per minute. Though I don't think it's related. What's driving me mad is that I can't figure out why server would start refusing connections. There is nothing in the logs. This server is a hosted dedicated server so hosting company created the OS image and I didn't write or go over every line of configuration. I'd do it but I'm at a loss as to where start looking. Any advice is appreciated.

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• SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

  - by Barkat Ullah

  Server details: RAM: 16GB HDD: 1000GB OS: Linux 2.6.32-220.7.1.el6.x86_64 Processor: 6 Core Please see the link below for my # top preview: I can often see the error mentioned in title in my plesk panel and my /etc/my.cnf configuration are as below: bind-address=127.0.0.1 local-infile=0 datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql max_connections=20000 max_user_connections=20000 key_buffer_size=512M join_buffer_size=4M read_buffer_size=4M read_rnd_buffer_size=512M sort_buffer_size=8M wait_timeout=300 interactive_timeout=300 connect_timeout=300 tmp_table_size=8M thread_concurrency=12 concurrent_insert=2 query_cache_limit=64M query_cache_size=128M query_cache_type=2 transaction_alloc_block_size=8192 max_allowed_packet=512M [mysqldump] quick max_allowed_packet=512M [myisamchk] key_buffer_size=128M sort_buffer_size=128M read_buffer_size=32M write_buffer_size=32M [mysqlhotcopy] interactive-timeout [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid open_files_limit=8192 As my server httpd conf is set to /etc/httpd/conf.d/swtune.conf and the configuration is as below: at prefork.c: <IfModule prefork.c> StartServers 8 MinSpareServers 10 MaxSpareServers 20 ServerLimit 1536 MaxClients 1536 MaxRequestsPerChild 4000 </IfModule> If I run grep -i maxclient /var/log/httpd/error_log then I can see everyday this error: [root@u16170254 ~]# grep -i maxclient /var/log/httpd/error_log [Sun Apr 15 07:26:03 2012] [error] server reached MaxClients setting, consider raising the MaxClients setting [Mon Apr 16 06:09:22 2012] [error] server reached MaxClients setting, consider raising the MaxClients setting I tried to explain everything that I changed to keep my server okay, but maximum time my server is down. Please help me which parameter can I change to keep my server okay and my sites can load fast. It is taking too much time to load my sites.

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• checksecurity / setuid changes, is this a bug or did somebody break in?

  - by Fabian Zeindl

  I received a mail by checksecurity from my ubuntu 12.04 server with the following content: --- setuid.today 2012-06-03 06:48:09.892436281 +0200 +++ /var/log/setuid/setuid.new.tmp 2012-06-17 06:47:51.376597730 +0200 @@ -30,2 +30,2 @@ - 131904 4755 2 root root 71280 Wed May 16 07:23:08.0000000000 2012 ./usr/bin/sudo - 131904 4755 2 root root 71280 Wed May 16 07:23:08.0000000000 2012 ./usr/bin/sudoedit + 143967 4755 2 root root 71288 Fri Jun 1 05:53:44.0000000000 2012 ./usr/bin/sudo + 143967 4755 2 root root 71288 Fri Jun 1 05:53:44.0000000000 2012 ./usr/bin/sudoedit @@ -42 +42 @@ - 130507 666 1 root root 0 Sat Jun 2 18:04:57.0752979385 2012 ./var/spool/postfix/dev/urandom + 130507 666 1 root root 0 Mon Jun 11 08:47:16.0919802556 2012 ./var/spool/postfix/dev/urandom First i was worried, then i realized that the change was actually 2 weeks ago, i think there was a sudo-update back then. Since checksecurity runs in /etc/cron.daily i wondered why i only get that email now. I looked into /var/log/setuid/ and found the following files: total 32 -rw-r----- 1 root adm 816 Jun 17 06:47 setuid.changes -rw-r----- 1 root adm 228 Jun 3 06:48 setuid.changes.1.gz -rw-r----- 1 root adm 328 May 27 06:47 setuid.changes.2.gz -rw-r----- 1 root root 1248 May 20 06:47 setuid.changes.3.gz -rw-r----- 1 root adm 4473 Jun 17 06:47 setuid.today -rw-r----- 1 root adm 4473 Jun 3 06:48 setuid.yesterday The obvious thing that confuses me is that the file setuid.yesterday is not from yesterday = Jun/16. Is this a bug?

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• Samba Does Not List Files In Shared Directory

  - by Sean M

  I am running Samba on a CentOS server, and I am experiencing a problem where it allows me to connect to the server and see a share, but shows the share as an empty directory. I find this behavior strange. Here is the stanza in my smb.conf for the given share: [seanm] path = /home/seanm writeable = yes valid users = seanm, root read only = No Here's what I see on the server side: [seanm@server ~]$ ls -l -rw-r--r-- 1 seanm seanm 40 Jan 4 13:45 pangram.txt And yet: [seanm@client ~]$ smbclient //server/seanm -U seanm -W WORKGROUP Enter seanm's password: Domain=[WORKGROUP] OS=[Unix] Server=[Samba 3.0.33-3.29.el5_5.1] smb: \> ls . D 0 Fri Jan 7 10:08:55 2011 .. D 0 Fri Jan 7 07:58:31 2011 58994 blocks of size 262144. 50356 blocks available This behavior is present on both a Windows client and a Linux client system. The behavior is present with the firewall on and with the firewall off, so it's not that. Neither /var/log/messages nor /var/log/secure have any complaints about Samba. I doubt that SELinux is a problem: just in case, here are the relevant settings. [root@server ~]# getsebool -a | grep samba samba_domain_controller --> off samba_enable_home_dirs --> on samba_export_all_ro --> off samba_export_all_rw --> off samba_share_fusefs --> off samba_share_nfs --> off use_samba_home_dirs --> on virt_use_samba --> off What am I doing wrong here, and what can I do to fix it?

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• Making "default saved" work with GRUB2...?

  - by baltusaj

  I just installed Moblin Operating System. It's using GRUB2. On my Ubuntu 8.04 GRUB 0.97 was being used in which i was using the default saved option comfortably. I found that with GRUB2 i should not edit /boot/grub/menu.lst directly but I did :) because my Moblin does not contain any /etc/default/grub where they say I should do the modification I want. So what I did is as following which did not work: default=saved timeout=1 #splashimage=(hd0,0)/boot/grub/splash.xpm.gz #hiddenmenu #silent title Moblin (2.6.31.5-10.1.moblin2-netbook) root (hd0,0) kernel /boot/vmlinuz-2.6.31.5-10.1.moblin2-netbook ro root=/dev/sda1 vga=current savedefault=1 title Pathetic Windows rootnoverify (hd0,1) chainloader +1 savedefault=0 By doing so I should have automatically switch between Moblin and Window at each boot but it's not working. Almost all the troubleshooters on internet are saying that I should enable the DEFAULT=save option in /etc/default/grub but I am unable to find this file. Any idea what else should I do? Thanks a lot Update: I used the equal to sign because by default my menu.lst had an entry as default=0. However, default 0, is also working fine. Moreover the menu.lst, i have is actually a symbolic link to ./grub.conf. I have also noticed that grub-intall and grub-set-default commands are not working.

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• How to back up a database with thousands of files

  - by Neal

  I am working with a Fedora server that runs a customized software package. The server software is quite old, and its database consists of 1,723 files. The database files are constantly changing - they continually grow and changes are not necessarily appended to the end. So right now, we currently back up every 24 hours at midnight when all users are off of the system and the database is in an internally consistent state. The problem is that we have the potential to lose an entire day's worth of work, which would be unrecoverable. So I'd like to know if there is a way to take some sort of an instantaneous snapshot of these database files that we could back up every 30 minutes or so. I've read about Linux LVM snapshots, and am thinking that I might be able to do accomplish the goal by taking a snapshot, rsync'ing the files to a backup server, then dropping the snapshot. But I've never done this before,so I don't know if this is the "right" fix. Any ideas on this? Any better solutions? Thanks!

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• Two DHCP interfaces asigned to two default gateways to OS

  - by user140600

  I have a Ubuntu box that has two networking interfaces (eth0 and wlan0). They are both configured for DHCP in /etc/network/interfaces, but they both assign a default gateway: /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto wlan0 iface wlan0 inet dhcp wireless-essid test Result of route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 172.16.1.1 0.0.0.0 UG 100 0 0 wlan0 0.0.0.0 10.0.0.1 0.0.0.0 UG 100 0 0 eth0 10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 172.16.1.0 0.0.0.0 255.255.255.0 U 0 0 0 wlan0 How can I set up /etc/network/interfaces to have only one default gateway, on the interface I want? Worst case scenario, how can I at least control which one gets on top on the route -n command, each boot? Note: This box will travel a lot, and will be connected to different networks, so I don´t know in advance the IP addresses/ranges it will have. Sometimes the default gw interface will be eth0. Sometimes it will be wlan0 ... So, this needs to be kind of automatic ...

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• Edubuntu video playback and apt-get

  - by asdasd

  They had installed some modified edubuntu's at school... So i have some questions about setting some things up: How we can play HD videos ? They are made for windows machines and are in .wmv format but we need to play them on our multimedia class but don't know how - which player, which codecs etc. How to edit properly the /etc/apt/sources file ? Anything we try to install via apt-get it just says that E:\ is not available. Please tell me which repositories to put in there so we could be able to install some tools. Where are usually viruses/trojans put in ubuntu ? I mean in which directories ? Because our computers are behaving really slow and we need to check for some malware manually - we are not even allowed to install any kind of AV software. So tell me the usual directories and places for hiding such files, how are they hiddem, how to recognize them etc. Any others nice tricks/tips that we need to know. Thank you very much in advance.

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• Google bots are severely affecting site performance

  - by Lynn

  I have an aggregate site on a linux server that pulls in feeds from a universe of about 2,000 blogs. It's in Wordpress 3.4.2 and I have a cron job that is staggered to run five times an hour on another server to pull in the stories and then publish them to the front page of this site. This is so I didn't put too much pressure all on one server. However, the Google bots, which visit a few times every hour bring the server to its knees in the morning and evenings when there is an increase in traffic on the site. The bots have something like 30,000 links to follow at this point. How do I throttle the bots to simply grab the new stories off the front page and stop there? EDIT- Details of my server configuration: The way we have this set up is the server that handles all the publishing is an unmanaged instance via AWS. It mounts the NFS server and connects to the RDS to update content, etc. You get to this publishing instance via a plugin that detects the wp-admin link and then redirects you into there. The front end app server also mounts the NFS and requests data from the RDS. It is the only one that has the WP Super Cache on it.... The OS is Ubuntu on the App server and the NFS runs CentOs. The front end is Nginx and the publishing server is Apache.

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• Virtualizing an Inline network appliance with VirtualBox (or VMWare)

  - by Tzury Bar Yochay

  My device, which is a Linux based IP in-liner is transparent to the network peripherals, that is, no IP address assigned to any of its interfaces. For the sake of the conversation, let's use ADSL connection as an example, while the device is inspecting the bi-directional traffic, the network is behaving same as if device was not there, attached to the wire (see Physical setup at the attached diagram). I wonder if I can enclosed that "device" within a Windows machine and have it operated virtually so it still seats inline between the ADSL router and the Windows netwroking interface by using virtual NICs, (or whatever their name is in windows), and inspecting the traffic, same as if it was on a separate physical device, the drawing under "Virtual Setup" in the attached diagram show what I am trying to achieve. Reading a bit on the VirtualBox docs, seems like binding the right side is relatively simple, perhaps I should have one network adapter set as Bridge Networking and VirtualBox will connect it to the physical NIC on the host machine, and network packets are exchanged directly, circumventing the host operating system's network stack (WinXP in my case). However, I have no idea how to achieve the left side of my diagram, which requires adding virtual NICs to windows and configure them correctly in a way to make that pipeline possible. I would appreciate any help. by the way, if that is not possible with VirtualBox but with other virtualization solution (e.g. VMWare), I would accept the other as well.

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• background jobs and ssh connections

  - by petrelharp

  This question has come up quite a lot (really a lot), but I'm finding the answers to be generally incomplete. The general question is "Why does/doesn't my job get killed when I exit/kill ssh?", and here's what I've found. The first question is: How general is the following information? The following seems to be true for modern Debian linux, but I am missing some bits; and what do others need to know? All child processes, backgrounded or not of a shell opened over an ssh connection are killed with SIGHUP when the ssh connection is closed only if the huponexit option is set: run shopt huponexit to see if this is true. If huponexit is true, then you can use nohup or disown to dissociate the process from the shell so it does not get killed when you exit. If huponexit is false, which is the default on at least some linuxes these days, then backgrounded jobs will not be killed on normal logout. But even if huponexit is false, then if the ssh connection gets killed, or drops (different than normal logout), then backgrounded processes will still get killed. This can be avoided by disown or nohup as in (2). There is some distinction between (a) processes whose parent process is the terminal and (b) processes that have stdin, stdout, or stderr connected to the terminal. I don't know what happens to processes that are (a) and not (b), or vice versa. Final question: How can I avoid behavior (3)? In other words, by default in Debian backgrounded processes run along merrily by themselves after logout but not after the ssh connection is killed. I'd like the same thing to happen to processes regardless of whether the connection was closed normally or killed. Or, is this a bad idea?

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• User http does not have write permissions directory?

  - by dwieeb

  I have a bit of an odd set up, I think. I have groups for each domain my server hosts, and I add the user http to each domain group along with the users that should have access to the groups' domains. In my php script running from a directory 'public_html', I try creating a file: <?php $output = ""; print exec('touch test 2>&1', $output); But I get touch: cannot touch `test': Permission denied and the file is not created. But here, clearly stated, the group has all permissions on the directory: drwxrwxr-x 5 dwieeb example.com 1024 Feb 4 05:19 public_html And here are the permissions on the php file in public_html that is trying to use the exec function: -rw-rw-r-- 1 dwieeb example.com 59 Feb 4 05:19 test.php How is this possible if http is part of the example.com group (as seen from a cat on /etc/group) and the directory has full permissions for the group? ... example.com:x:1000:dwieeb,http I'm stumped. EDIT (since apparently I'm not cool enough to answer my own questions yet): Ah, I found the problem. Yes, I restarted Nginx, but the php-fpm daemon must be restarted as well when http is added to the group for my domain. On Arch Linux: rc.d restart php-fpm

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• Terminate child processes on ctrl-c

  - by jackweirdy

  In tiny core linux, I have the following script: #!/bin/sh # ~/.X.d/freerdp.sh rdp(){ while true do xfreerdp -f [IP Address] done } rdp & It's pretty simple; when X starts up and checks the .X.d directory (as is the case in tiny core) it finds and executes this script. The script starts up freerdp and keeps a connection open to the server by restarting it whenever it closes. As you can see from the rdp & line, the function is run in the background to allow X to continue its startup routine. The problem is that whenever I cancel X with a Ctrl-Alt-Backspace the rdp process doesn't die. I'm looking for a way to kill the process as soon as X finishes, either through: A) a script, executed on X closing, which kills the process or B) by modifying the script to check the return value of the xfreerdp command. NB - if the solution does check the return value, it must only end if the command fails to open the X display. For that reason, if you could point me to a reference for xfreerdp return values I'd be grateful.

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• How to create a init.d script for openssh-server which was compiled and installed from source using configure + make + make install?

  - by Patrick L

  I have installed openssh-server in my Ubuntu PC using apt-get install openssh-server. The version is 5.9. Now, I would like to compile and install openssh-server version 6.2 from source codes. I have successfully downloaded the source codes, and run the following commands: ./configure make make install I found that the new version of openssh-server was installed into /usr/local/sbin/. The old version of openssh-server is in /usr/sbin/. I found that the service script in /etc/init.d/ssh is still pointing to /usr/sbin/. And the old openssh-server (v5.9) is still running. How can I replace the old openssh-server with the new openssh-server that I have just compiled and installed? How can I create a init.d script to start and stop the new openssh-server that I've compiled from source manually? How to start the new openssh-server on boot? When I install openssh-server using apt-get install, the config files will be installed into /etc/ssh/. If I compile and install it from source, where is the config file? If I compiled openssh-server from source, but I install openssh-client package using apt-get install, will there be any config files conflict? Thanks.

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• How to place a virtual machine in DMZ?

  - by Giordano

  I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products we're developing and make available other products for demo purposes. One of the server NICs is configured with a public IP. However before exposing anything on the web I would like to be sure that if one of the virtual machines get compromised, the attacker doesn't reach the rest of the hosts. What I would like to do is to put these virtual machines into a DMZ. These are the steps I'm planning to do: Create a tap interface in the virtualization host (let's say tap1) Create a bridge using tap1 and give it an IP in a subnet separate from the other hosts. Let's say 10.0.0.1 Attach the DMZ virtual machines to the bridge and configure their IP statically (10.0.0.2, 10.0.0.3, etc...) Using UFW, forbid any traffic from 10.0.0.0/24 to any of the internal hosts, allow the traffic from the internal hosts towards 10.0.0.0/24 and expose the virtual machines on the web using port forwarding. Do you think this setup is safe? Can you suggest any improvement or a better/safer approach? Thanks in advance!

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• Installing and running two postgresql versions on different ports (or two instances of same server)

  - by Andrius

  I have postgresql 9.1 installed on my machine (Ubuntu). I need another postgresql server that would run next to the old one. Exact version does not matter, but I'm thinking of using 9.2 version. How could I properly install and run another postgresql version without screwing old one (like upgrading). So those versions would run independently on different ports. Old one on 5432 and new one on 5433 for example. The reason I need this is for two OpenERP versions databases. If I run two OpenERP servers (with different versions) on single postgresql port, it crashes because new OpenERP version detects old versions database and tries to run it, but it crashes because it uses another schemes. P.S or maybe I could just run same postgresql server on two ports? Update So far I tried this: /usr/lib/postgresql/9.1/bin/pg_ctl initdb -D main2 It created new cluster. I changed port to 5433 in new clusters directory postgresql.conf file. Then ran this: /usr/lib/postgresql/9.1/bin/pg_ctl -D main2 -l logfile start I got response server starting. But when I tried to enter new cluster's template database with: psql template1 -p 5433 I got this error: psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5433"? Also now when I try to stop server with: /usr/lib/postgresql/9.1/bin/pg_ctl -D main2 -l logfile start I get this error: pg_ctl: PID file "main2/postmaster.pid" does not exist Is server running? So I don't understand if server is running and what I'm missing here? Update Found what was wrong. Stupid me. I didn't notice that when I changed port in .conf file, that line was commented already. So actually I didn't change anything first time, but thought I did and it used default 5432 port.

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• Prevent Amazon EC2 Time zone from reverting back on yum update

  - by D.Tate

  I use an Amazon EC2 server instance that runs a distro called Amazon Linux AMI. (I've read that it is based on CentOS/Red Hat). My specific version is the 2012.09 release. Anyway, I was able to change the time zone about a week ago from the default UTC to America/New_York (which is EST/EDT). The command I used to change it was: ln -sf /usr/share/zoneinfo/America/New_York /etc/localtime ...thanks to this other Server Fault question. At that point, I was able to run date from the the command line, and it correctly displayed the EDT time. And even after EDT "fell back" to EST this past Sunday, I was pleased to find that running date still produced the correct local time. So that was great. However, after running a yum update yesterday, it seems that my time zone got reverted back to plain 'ol UTC. I even checked the last modified time of /etc/localtime file, and indeed it confirmed that it had been modified around the same time I had updated. Is there any way to prevent this from happening again, or will I be stuck resetting the time zone every time I do a yum update?

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• auto-mounting shared folders in VirtualBox

  - by brannerchinese

  I am writing to ask what the effect of the auto-mounting process is in VirtualBox, and where the folders can be accessed within a guest Linux system if auto-mount is used. I have VirtualBox 4.0.4 installed on Mac OS 10.6.7, with Guest Additions apparently running correctly. The guest OS is Ubuntu 10.04, and I observe no apparent problems with it. I find that if the shared folders have "auto-mount" unchecked in the VirtualBox settings, they can then be mounted using the prescribed syntax sudo mount -t vboxsf folder_name path_to_mount_point and all works as it is supposed to. But if the auto-mount option is checked, then I find that I can no longer mount the shared folders manually. I get the error mounting failed with the error: Invalid argument and the folders also do not appear to mount anywhere else accessible to me. Using the syntax sudo mount -t vboxsf without specifying a path installs them in /media, with their names prefixed with sf_, but they are not easily accessible there and I have not been able to change their owner using chown, either. Thanks for your patient explanation.

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• Join multiple filesystems (on multiple computers) into one big volume

  - by jm666

  Scenario: Have 10 computers, each have 12x2TB HDDs (currently) in raidZ2 (10+2) configuration, so, in the each computer i have one approx. 20TB volume. Now, need those 10 separate computers (separate raid groups) join into one big volume. What is the recommended solution? I'm thinking about the FCoE (10GB ethernet). So, buying into each computer FCoE (10GB ethernet card) and - what need more on the hardware side? (probably another computer, FCoE switch? like Cisco Nexus?) The main question is: what need to install and configure on each computer? Currently they have freebsd/raidz2, but it is possible change it into Linux/Solaris if needed. Any helpful resource what talking about how to build a big volumes from smaller raid-groups (on the software side) is very welcomed. So, what OS, what filesystem, what software - etc. In short: want get one approx. 200TB storage (in one filesystem) from already existing computers/storage. Don't need fast writes, but need good performance on reading data. (as a big fileserver), what will works transparently, so when storing data don't want care about onto what computer the data goes. (e.g. not 10 mountpoints - but one big logical filesystem). Thanks.

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• Postfix character encoding?

  - by Camran

  I use Postfix as a mailserver. I have Ubuntu OS. Then I use PHP to send emails. Problem is that none of my emails are encoded properly by a mailsoftware which my VPS provider uses. According to them, the problem lies with me. It is only the name field which isn't encoded properly. For example "Björn" becomes "Björn" in my emails. However, when I echo the $name, it outputs "Björn" which is correct. Also, gmail and hotmail does show it correctly. The strange part is that the "text" (the message itself) is encoded properly. I use the following for sending mail: $headers="MIME-Version: 1.0"."\n"; $headers.="Content-type: text/plain; charset=UTF-8"."\n"; $headers.="From: $name <$email>"."\n"; $name= iconv(mb_detect_encoding($name), "UTF-8//IGNORE//TRANSLIT", $name); //// I HAVE TRIED WITH AND WITHOUT THE LINE ABOVE, NO DIFFERENCE mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $text, $headers, '[email protected]'); I have tried with and without the iconv line also, no luck. The last thing I can think of is POSTFIX, could there be a setting for character encoding there? Anybody knows?

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