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Monitor a log file on Linux and send each line to another program

- by mlambie

I run an apt-cacher-ng server on Ubuntu Linux which writes logs in the following format: 1299745593|O|149406|XXX.XXX.XXX.XXX|uburep/pool/main/t/tiff/libtiff4_3.9.2-2ubuntu0.4_amd64.deb 1299745593|O|10154976|XXX.XXX.XXX.XXX|uburep/pool/main/l/linux-firmware/linux-firmware_1.34.4_all.deb 1299748529|O|39368|XXX.XXX.XXX.XXX|uburep/pool/main/n/nagios-nrpe/nagios-nrpe-server_2.12-4ubuntu1_amd64.deb 1300155440|O|680100|XXX.XXX.XXX.XXX|uburep/pool/main/t/tzdata/tzdata_2011c-0ubuntu0.10.04_all.deb It shows the timestamp, direction (in or out), byte count, IP and filename. Every time a line is written to it, I'd like to also send that line to another program. I will have this program insert the line into a database so that I can crunch some statistics about how much bandwidth we're saving through operating a caching server. I do not want to cat the log file every X minutes (via cron) looking for new entries as it'd be somewhat computationally uneconomical. Instead I'd prefer to have a daemon monitor the log, and when a change is detected, each line is sent to my database-insertion script. Will swatch achieve this, or are there better options?

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Dovecot and StartSSL problems with issuer

- by knoim

I am using dovecot (1) and trying to get my StartSSL certificate running. ssl_key_file points to my private key I tried pointing ssl_cert_file to my public key, with and without using the class1 certificate from http://www.startssl.com/certs/sub.class1.server.ca.pem as ssl_ca_file aswell as combing them with cat publickey sub.class1.server.ca.pem chained My mail client keeps telling me the certificate has no issuer, but doing openssl x509 on my public certificate tells me it is C=IL, O=StartCom Ltd., OU=Secure Digital Certificate Signing, CN=StartCom Class 1 Primary Intermediate Server CA My option for the CSR were: openssl req -new -newkey rsa:4096 -nodes Dovecot's log doesn't mention any problems. EDIT: Doesn't seem to be a problem with dovecot. I am having the same problem with postfix. openssl verify gives me the same error.

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How to use public-key ssh authentication

- by Poma

I have 2 ubuntu 12.04 (beta) servers (node1 and node2) and want to establish passwordless root access between them. Other users should not have access to other boxes. Also note that ssh default port is changed to 220. Here's what I did: sudo -i cd /root/.ssh ssh-keygen -t rsa # with default name and empty password cat id_rsa.pub > authorized_keys then copied id_rsa & id_rsa.pub to node2 and added id_rsa.pub to authorized_keys. Both hosts have the same /root/.ssh/config file: Host node1 Hostname 1.2.3.4 Port 220 IdentityFile /root/.ssh/id_rsa Host node2 Hostname 5.6.7.8 Port 220 IdentityFile /root/.ssh/id_rsa Now the problem is that when I type ssh node2 it asks me for password. What may be the problem?

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File ownership and permissions on web site PHP files

- by columbo

Hello, I am learning the basics of linux servers so I am green. I have an Ubuntu server upon which there are websites that I have inherited. In a fit of security worry I decided to check out the ownership of the web site files. They are all 2016:sites. If I run the command 'cat /etc/group | more' I can see that the group exists. But when I run 'lastlog' the user 2016 does not appear. I started to worry that 2016 might be the username of web users connecting from the web so I set the permissions on a testfile to chmod 600, giving read permissions to only the file owner. Sure enough I could still access the file from the web. Can anyone suggest what is going on here? I tried creating a new user and giving them file ownership but then when I access the file from the web it wants me to have all directories up stream owned by the same person. Thanks

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openssl creates invalid signature if run by a different user

- by divB

Very strange problem here: openssl successfully creates signatures but only those created as root are valid whereas created by another user (www-data) are invalid! All files are readable and there are not error messages: # echo -ne Test | openssl dgst -ecdsa-with-SHA1 -sign activation.key > /tmp/asRoot.der # su www-data $ echo -ne Test | openssl dgst -ecdsa-with-SHA1 -sign activation.key > /tmp/asWww-data.der $ uname -a Linux linux 2.6.32-5-openvz-amd64 #1 SMP Mon Feb 25 01:16:25 UTC 2013 i686 GNU/Linux $ cat /etc/debian_version 6.0.7 Both files (asRoot.der and asWww-data.der) are transfered to a different computer for verification with the public key: $ echo -ne Test | openssl dgst -verify activation.pub -keyform DER -signature asRoot.der Verified OK $ echo -ne Test | openssl dgst -verify activation.pub -keyform DER -signature asWww-data.der Verification Failure That can't be true! What's wrong here?

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CentOS 6: Can not start NFS

- by Chris

I am unable to start the NFS service. When starting there is no error. But the services are stopt after it. No messages at all in /var/log/messages. Same happens to rpcbind serivce. Any idea what this could be? I also tried to disable iptables. [root@server1 ~]# service nfs start [root@server1 ~]# service nfs status rpc.svcgssd is stopped rpc.mountd is stopped nfsd is stopped rpc.rquotad is stopped [root@server1 ~]# service rpcbind start [root@server1 ~]# service rpcbind status rpcbind is stopped [root@server1 ~]# cat /etc/exports /tmp *(ro) [root@server1 ~]# chkconfig --list | egrep '(rpcbind|nfs)' nfs 0:off 1:off 2:on 3:on 4:on 5:on 6:off nfslock 0:off 1:off 2:on 3:on 4:on 5:on 6:off rpcbind 0:off 1:off 2:on 3:on 4:on 5:on 6:off

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How to mount remote samba share from local host with multiple groups?

- by Dragos

I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 $ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has? Is there a way to: Mount the remote samba with multiple groups on the local system? Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs; but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. And the last solution would be NFS but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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nfs server on cygwin slow

- by Weltenwanderer

The setup: We run an instance of cygwin nfsd on a Windows 2008 Server (Xeon 3,2 GHz). There are several Sun Solaris and SunOS machines accessing the shares. This is the exports file: /disk3 (rw,all_squash) /disk2 (rw,all_squash) Those paths are soft linked to the relevant cygdrive/d/path/to/dir paths. Some of the folders contain up to 10k files. The Problem: ls -la on the mounted folder on the sun boxes takes 2 - 3 minutes and the general read performance is really bad. cat filename displays the file in slow bursts and this hurts performance on tasks that access those shared files heavily. Processor load is not the issue, the nfs server idles most of the time, the cygwin tasks never get over 1% load.

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ldirectord ipvsadm not show reals ip and not work wtih pacemaker and corosync

- by miguer27

first thanks for your time. I'm having a problem with ldirectord that I can not solve, I comment my situation: I have two nodes with pace maker and corosync and configure somes resources: root@ldap1:/home/mamartin# crm status Last updated: Tue Jun 3 12:58:30 2014 Last change: Tue Jun 3 12:23:47 2014 via cibadmin on ldap1 Stack: openais Current DC: ldap2 - partition with quorum Version: 1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff 2 Nodes configured, 2 expected votes 7 Resources configured. Online: [ ldap1 ldap2 ] Resource Group: IPV_LVS IPV_4 (ocf::heartbeat:IPaddr2): Started ldap1 IPV_6 (ocf::heartbeat:IPv6addr): Started ldap1 lvs (ocf::heartbeat:ldirectord): Started ldap1 Clone Set: clon_IPV_lo [IPV_lo] Started: [ ldap2 ] Stopped: [ IPV_lo:1 ] root@ldap1:/home/mamartin# crm configure show node ldap2 \ attributes standby="off" node ldap1 \ attributes standby="off" primitive IPV-lo_4 ocf:heartbeat:IPaddr \ params ip="192.168.1.10" cidr_netmask="32" nic="lo" \ op monitor interval="5s" primitive IPV-lo_6 ocf:heartbeat:IPv6addrLO \ params ipv6addr="[fc00:1::3]" cidr_netmask="64" \ op monitor interval="5s" primitive IPV_4 ocf:heartbeat:IPaddr2 \ params ip="192.168.1.10" nic="eth0" cidr_netmask="25" lvs_support="true" \ op monitor interval="5s" primitive IPV_6 ocf:heartbeat:IPv6addr \ params ipv6addr="[fc00:1::3]" nic="eth0" cidr_netmask="64" \ op monitor interval="5s" primitive lvs ocf:heartbeat:ldirectord \ params configfile="/etc/ldirectord.cf" \ op monitor interval="20" timeout="10" \ meta target-role="Started" group IPV_LVS IPV_4 IPV_6 lvs group IPV_lo IPV-lo_6 IPV-lo_4 clone clon_IPV_lo IPV_lo \ meta interleave="true" target-role="Started" location cli-prefer-IPV_LVS IPV_LVS \ rule $id="cli-prefer-rule-IPV_LVS" inf: #uname eq ldap1 colocation LVS_no_IPV_lo -inf: clon_IPV_lo IPV_LVS property $id="cib-bootstrap-options" \ dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \ cluster-infrastructure="openais" \ expected-quorum-votes="2" \ no-quorum-policy="ignore" \ stonith-enabled="false" \ last-lrm-refresh="1401264327" rsc_defaults $id="rsc-options" \ resource-stickiness="1000" The problem is in the ipvsadm only show a one real IP, when i configured two now, show the ldirector.cf: root@ldap1:/home/mamartin# ipvsadm IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags - RemoteAddress:Port Forward Weight ActiveConn InActConn TCP ldap-maqueta.cica.es:ldap wrr - ldap2.cica.es:ldap Route 4 0 0 TCP [[fc00:1::3]]:ldap wrr - [[fc00:1::2]]:ldap Route 4 0 0 root@ldap1:/home/mamartin# cat /etc/ldirectord.cf checktimeout=10 checkinterval=2 autoreload=yes logfile="/var/log/ldirectord.log" quiescent=yes #ipv4 virtual=192.168.1.10:389 real=192.168.1.11:389 gate 4 real=192.168.1.12:389 gate 4 scheduler=wrr protocol=tcp checktype=on #ipv6 virtual6=[[fc00:1::3]]:389 real6=[[fc00:1::1]]:389 gate 4 real6=[[fc00:1::2]]:389 gate 4 scheduler=wrr protocol=tcp checkport=389 checktype=on and in the logs I see nothing clear: root@ldap1:/home/mamartin# ldirectord -d /etc/ldirectord.cf start DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.11:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.11:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 0) DEBUG2: Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) DEBUG2: Disabled real server=on:tcp:192.168.1.12:389:::4:gate:\/: (virtual=tcp:192.168.1.10:389) DEBUG2: Checking on: Real servers are added without any checks DEBUG2: Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) DEBUG2: Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Running system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) Destination already exists root@ldap1:/home/mamartin# cat /var/log/ldirectord.log [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Quiescent real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 0) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.12:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t 192.168.1.10:389 -r 192.168.1.12:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: 192.168.1.12:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: 192.168.1.11:389 (tcp:192.168.1.10:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: 192.168.1.11:389 (192.168.1.10:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::2]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] system(/sbin/ipvsadm -a -t [[fc00:1::3]]:389 -r [[fc00:1::2]]:389 -g -w 4) failed: [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Added real server: [[fc00:1::2]]:389 ([[fc00:1::3]]:389) (Weight set to 4) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Resetting soft failure count: [[fc00:1::1]]:389 (tcp:[[fc00:1::3]]:389) [Tue Jun 3 09:39:29 2014|ldirectord.cf|19266] Restored real server: [[fc00:1::1]]:389 ([[fc00:1::3]]:389) (Weight set to 4) do not know if this is a bug or a configuration error, can anyone help? Regards.

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How to use second volume devide of amazon EC2

- by Khoyendra Pande

I have two volumes of amazon EC2 where by default 1 GiB volume using which has fulled. Now I want to use my second volume which is 9 Gim. I used command cat /proc/partitions I got major minor #blocks name 202 1 1048576 xvda1 202 80 9437184 xvdf Then I hit mkfs.ext3 -F /dev/sdf its showing mkfs.ext3: No such file or directory while trying to determine filesystem size then I hit command df and I got Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 1032088 1031280 0 100% / tmpfs 313160 8 313152 1% /lib/init/rw udev 297800 24 297776 1% /dev tmpfs 313160 4 313156 1% /dev/shm overflow 1024 32 992 4% /tmp means still I am unable to use my 9 GiB space Volume. I am conform I have two volume where attachment information is i-7e4fb41c:/dev/sda1 (attached) and i-7e4fb41c:/dev/sdf (attached) where only sda1 is using. Any one know how may I use my second volume(sdf). Thx

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How to mount remote sambe from local host with multiple groups ?

- by Dragos

I am using mount.cifs to mount a remote samba share (both client and server are Ubuntu server 8.04) like this: mount.cifs //sambaserver/samba /mountpath -o credentials=/path/.credentials,uid=someuser,gid=1000 `$ cat .credentials username=user password=password I mounted a user from local system with username and password with mount.cifs but the problem is that the user is part of multiple groups on the remote system and with mount.cifs I can only specify one gid. Is there a way to specify all the gids that the remote user has ? Is there a way to: 1) Mount the remote samba with multiple groups on the local system ? 2) Browse the mount from 1) with the terminal since I want to pass some files from samba as arguments to local programs. Other solutions would be: nautilus sftp:// which runs through gvfs but the newer gnome does not write to disk the ~/.gvfs anymore so I can't browse it in terminal. An the last solution would be nfs but that means that I have to synchronize the uids and gids on the local system with the ones from the server.

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configuring cgi-bin using .htaccess

- by Alexandru

I'm trying to configure a directory as cgi-bin using .htaccess, but when I try to access the executables, the files are downloaded. I'm using apache2.2. What is the problem? My .htaccess looks like: # cat www/cgi-bin/.htaccess Options +ExecCGI AddHandler cgi-script cgi pl File permissions are # ls -1la www/cgi-bin/ total 60 drwxr-xr-x 2 root root 4096 iun 10 19:22 . drwxr-xr-x 5 root root 4096 iun 10 19:18 .. -rw-r--r-- 1 root root 46 iun 10 19:23 .htaccess -rwxr-xr-x 1 root root 15358 iun 10 19:23 paperload.cgi -rwxr-xr-x 1 root root 12728 iun 10 19:23 papers.cgi -rwxr-xr-x 1 root root 12593 iun 10 19:23 paperview.cgi

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does the *physical* order/location of drives in a mdadm-managed RAID-10 array matter?

- by locuse

i've setup a 4-drive RAID-10 array using mdadm-managed, software-raid on an x86_64 box. it'd up & running and works as expected, cat /proc/mdstat md127 : active raid10 sdc2[2] sdd2[3] sda2[0] sdb2[1] 1951397888 blocks super 1.2 512K chunks 2 far-copies [4/4] [UUUU] bitmap: 9/466 pages [36KB], 2048KB chunk atm the four SATA drives are physically plugged into the motherboard's 1st four SATA ports. i'd like to gather the necessary/complete info for catastrophic recovery. reading starting here, http://neil.brown.name/blog, and the mailing list, i'm not yet completely confident i have it right. i understand 'drive order matters'. is that logical, &/or physical order that matters? if i unplugged the four drives in this array, and plugged them each back into different ports on the motherboard or a pci card, as long as i've changed nothing in software config, will the array correctly auto-re-assemble?

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Methodologies for performance-testing a WAN link

- by Chopper3

We have a pair of new diversely-routed 1Gbps Ethernet links between locations about 200 miles apart. The 'client' is a new reasonably-powerful machine (HP DL380 G6, dual E56xx Xeons, 48GB DDR3, R1 pair of 300GB 10krpm SAS disks, W2K8R2-x64) and the 'server' is a decent enough machine too (HP BL460c G6, dual E55xx Xeons, 72GB, R1 pair of 146GB 10krpm SAS disks, dual-port Emulex 4Gbps FC HBA linked to dual Cisco MDS9509s then onto dedicated HP EVA 8400 with 128 x 450GB 15krpm FC disks, RHEL 5.3-x64). Using SFTP from the client we're only seeing about 40Kbps of throughput using large (2GB) files. We've performed server to 'other local server' tests and see around 500Mbps through the local switches (Cat 6509s), we're going to do the same on the client side but that's a day or so away. What other testing methods would you use to prove to the link providers that the problem is theirs?

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Escape a ! in the password parameter of wget

- by Dave

I'm trying to execute something like this: wget --user=foo --password=bar! url The ! in the password is causing problems. I've tried escaping it with \, as in --password=bar\! I've tried encapsulating in single and double quotes. I put the password in a separate file and tried --password=cat pass.txt Each time, I get a 403 Forbidden. Using -d, I see that the SSL handshake is successful. On the Windows command line, the command works. My assumption is that I need to escape the ! differently, but I don't know how else.

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How to tell if linux disk IO is causing excessive (> 1 second) application stalls

- by noahz

I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for several seconds at a time. I suspect that something related to ext3 vsfs (Veritas Filesystem) functionality (and/or how it interacts with the OS) is the culprit. What steps can I take to confirm or refute this theory? I am aware of iostat and /proc/diskstats as starting points. Revised title to de-emphasize journaling and emphasize "stalls" I have done some googling and found at least one article that seems to describe behavior like I am observing: Solving the ext3 latency problem Additional Information Red Hat Enterprise Linux Server release 5.3 (Tikanga) Kernel: 2.6.18-194.32.1.el5 Primary application disk is fiber-channel SAN: lspci | grep -i fibre 14:00.0 Fibre Channel: Emulex Corporation Saturn-X: LightPulse Fibre Channel Host Adapter (rev 03) Mount info: type vxfs (rw,tmplog,largefiles,mincache=tmpcache,ioerror=mwdisable) 0 0 cat /sys/block/VxVM123456/queue/scheduler noop anticipatory [deadline] cfq

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Disable NSS LDAP IPv6 (AAAA) lookups

- by pilcrow

Question: How can I disable inet6 AAAA queries for my LDAP server during (LDAP-backed) NSS lookups on a CentOS (RHEL) 5 machine? Background: I've servers configured to consult ldap://ldap.internal for NSS passwd and group lookups. Every relevant NSS lookup, for example the getpwuid(3) implied by an ls -l which needs to translate UIDs to network user names, performs the following DNS dance before connecting to the ldap server: AAAA? ldap.internal -> (no records) AAAA? ldap.internal.internal -> NXDomain A? ldap.internal -> 192.168.3.89 I'd like to skip the first two queries completely. Configuration: [server]$ cat /etc/redhat-release CentOS release 5.4 (Final) [server]$ grep ^passwd /etc/nsswitch.conf passwd: files ldap [server]$ grep ^uri /etc/ldap.conf uri ldap://ldap.internal/ For what it's worth, IPv6 support is otherwise disabled on these systems: [server]$ grep off /etc/modprobe.conf alias ipv6 off alias net-pf-10 off [server]$ echo "$(ip a | grep -c inet6) IPv6-enabled interfaces" 0 IPv6-enabled interfaces

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LInux (Ubuntu Karmic) equivalent to Pawsense

- by LRE

I now work from a home office - much to the delight of my cats. One in particular likes to come for a hug several times a day. That in itself is fine but he tends to sit on my laptop keyboard whilst I'm working on my desktop and vice-versa. Also he'll walk across any keyboard I'm actually using at the time. I've found Pawsense and would like to know if anyone can suggest a Linux equivalent (or some incantations to achieve the same). Training him out of sitting on the keyboard is likely to prove fruitless (a suggested here). He's far more pig-headed than I am. This conversation discusses some utilities like xlock et al but I'd prefer if possible to have something more along the lines of Pawsense that doesn't lock the keyboard but "simply" intercepts cat-like typing. Thanks

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What is the right way to use Internet Sharing in OS X?

- by Bob King

For a while now I've been using the Wireless in my Mac Mini as a seperate WiFi access point because my main router doesn't quite cover my whole house. There is a dedicated CAT 5E line down to the Mini, which has a static IP address. I've turned Internet Sharing on, using Airport/WiFi but it seems my options for security are limited. Can I do WPA2? Also, it seems like my iPhone only connects 25% of the time, and the rest of the time it claims I've given a bad password. I've tried "Forget this network" repeatedly.

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Retrieve malicious IP addresses from Apache logs and block them with iptables

- by Gabriel Talavera

Im trying to keep away some attackers that try to exploit XSS vulnerabilities from my website, I have found that most of the malicious attempts start with a classic "alert(document.cookie);\" test. The site is not vulnerable to XSS but I want to block the offending IP addresses before they found a real vulnerability, also, to keep the logs clean. My first thought is to have a script constantly checking in the Apache logs all IP addresses that start with that probe and send those addresses to an iptables drop rule. With something like this: cat /var/log/httpd/-access_log | grep "alert(document.cookie);" | awk '{print $1}' | uniq Why would be an effective way to send the output of that command to iptables? Thanks in advance for any input!

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mdadm - Recovering a 'split' RAID1 array

- by Hamza

I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system. I now seem to have two RAID volumes, as reported by: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : active raid1 sdc[1] 2096116 blocks super 1.2 [2/1] [_U] md127 : active (auto-read-only) raid1 sdb[0] 2096116 blocks super 1.2 [2/1] [U_] unused devices: <none> Not exactly sure where to go from here. How can I merge and re-sync these volumes without data loss? Thanks.

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Caching DNS server (bind9.2) CPU usage is so so so high

- by Gk.

I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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iis php internal server error

- by user1633206

I developed a website, using php/mysql running at IIS Server as CGI Server API. Suddenly it gives me error 500 after two weeks. It has lot of scripts but index.php home is working. But other script that has header redirection What's wrong with my scripts. livehttp addon of firefox says.. GET /allplans.php?lang=ar&cat=1 HTTP/1.1 Host: www.myhost.com... [edited] User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive Cache-Control: max-age=0 HTTP/1.1 500 Internal Server Error Content-Type: text/html Server: Microsoft-IIS/7.5 X-Powered-By: ASP.NET Date: Mon, 03 Sep 2012 08:09:13 GMT Content-Length: 1208 Connection: Keep-Alive

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Syntax for piping varnish logs to rotatelogs

- by jetboy

Ubuntu 12.04 Server x64, Varnish 3.0.2 I'm trying to pipe varnishncsa's logs through Apache's rotatelogs, and running from the shell, things work fine: sudo varnishncsa -a -P /var/run/varnishncsa/varnishncsa.pid |/usr/sbin/rotatelogs /var/log/varnish/varnish.log.%Y%m%d%H 3600 creates a new logfile in /var/log/varnish, with rotation every hour (3600 seconds). However, I'm struggling to get things working the same way inside /etc/init.d/varnishncsa: PATH=/sbin:/bin:/usr/sbin:/usr/bin DAEMON=/usr/bin/$NAME PIDFILE=/var/run/$NAME/$NAME.pid LOGFILE=/var/log/varnish/varnishncsa.log USER=varnishlog DAEMON_OPTS="-a -P ${PIDFILE}" DAEMON_PIPE="|/usr/sbin/rotatelogs /var/log/varnish/varnish.log.%Y%m%d%H 3600" ... start_varnishncsa() { output=$(/bin/tempfile -s.varnish) log_daemon_msg "Starting $DESC" "$NAME" create_pid_directory if start-stop-daemon --start --verbose --pidfile ${PIDFILE} \ --chuid $USER --exec ${DAEMON} -- ${DAEMON_OPTS} \ > ${output} 2>&1; then log_end_msg 0 else log_end_msg 1 cat $output exit 1 fi rm $output } Where should I put DAEMON_PIPE in the above code? I've tried at the end of: if start-stop-daemon --start --verbose --pidfile ${PIDFILE} which is where additional command line parameters usually go, but it isn't creating a logfile.

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yum install gcc fails with invalid linux.dropbox.com/fedora directory

- by john

I am relatively new to Linux administration. I have installed Centos 6.5 (under VirtualBox on a Win7pro system). When I try to install gcc to the system using yum, I get the following results: [root@localhost etc]# yum clean all Loaded plugins: fastestmirror, refresh-packagekit, security Cleaning repos: Dropbox base extras updates Cleaning up Everything Cleaning up list of fastest mirrors [root@localhost etc]# yum install gcc Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors * base: mirrors.tummy.com * extras: mirrors.cat.pdx.edu * updates: centos.mirror.freedomvoice.com http://linux.dropbox.com/fedora/6/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found" Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: Dropbox. Please verify its path and try again It appears that the linux.dropbox.com/fedora/6 subdirectory does not exist. Does anyone have any ints/answers for me. Thanks.

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