Planet Malaysia » How’s To

How to Install Webmin on OpenFiler

Planet Malaysia — Sun, 24 Apr 2011 06:45:16 +0000

Webmin is a web-based interface for system administration for Unix. Using any modern web browser, you can setup user accounts, Apache, DNS, file sharing and much more. And Openfiler is a network storage OS with web based management user interface powered by Linux. Combination of both Webmin and Openfiler definitely help non-Linux or non-IT guy manage the whole Linux file server.

Today, I will not share how to configure Openfile here and I just would like to share about How to Install Webmin on OpenFiler.

SSH to Openfiler server with root user.
Make sure you are in “/root” folder (Type cd /root).
Type wget http://prdownloads.sourceforge.net/webadmin/webmin-1.540-1.noarch.rpm (please change according to Webmin version or refer to http://www.webmin.com/download.html)
Type rpm2cpio ~/webmin-1.540-1.noarch.rpm > ~/webmin-1.540-1.cpio
Type cpio -idmv < ~/webmin-1.540-1.cpio
You should see 2 folder “etc” and “usr” created under “/root” folder.
Copy the files from the “etc” folder
Type cp ~/etc/init.d/webmin /etc/init.d/
Type cp ~/etc/pam.d/webmin /etc/pam.d/
Type mv ~/usr/libexec/webmin /usr/libexec/
Type chmod 777 -R /usr/libexec/webmin/
Type /usr/libexec/webmin/setup.sh for Webmin setup
Follow the Webmin setup wizard
Webmin installation done and you can login to Webmin now.

Congratulations! You’re done! Open your Web Browser and login to your Webmin now.

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lppasswd: Unable to open passwd file: Permission denied

Planet Malaysia — Wed, 11 Nov 2009 07:28:40 +0000

The lppasswd command used to adds, changes, or deletes passwords in the CUPS digest password file which refer to /etc/cups/passwd.md5.

In order to create a new CUPS administrator user, enter a command: lppasswd -g sys -a username.

I’m having a problem creating a new user with error message: “lppasswd: Unable to open passwd file: Permission denied” today.

And I just would like to share the solution as below:

1. List /usr/bin/lppasswd file owner and permission
planetmy:~ # ls -l /usr/bin/lppasswd -rwsr-xr-x 1 lp sys 9428 Nov 29 2005 /usr/bin/lppasswd

2. Change lppasswd ownership
planetmy:~ # chown root /usr/bin/lppasswd

3. Add a new user and it worked
planetmy:~ # lppasswd -g sys -a cupadmin

4. Make sure you have correct permission for file /etc/cups/passwd.md5
planetmy:~ # ls -l /etc/cups/passwd.md5 -rw------- 1 lp lp 90 Nov 11 08:03 /etc/cups/passwd.md5

5. Make sure you change /usr/bin/lppasswd file back to normal
planetmy:~ # chown lp /usr/bin/lppasswd

Enjoy!

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How To Capture PUTTY Session Log

Planet Malaysia — Tue, 23 Jun 2009 07:28:50 +0000

PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It is written and maintained primarily by Simon Tatham.

Here I would like to share How To Capture PUTTY Session Log.

1. To capture a session with PuTTY, open up a PUTTY.
2. Look for Category Session -> Logging
3. Under Session Logging, choose “All session output” and key in your desire log filename(default is putty.log).

4. This should create the file in the location you choose and start loggin everyting from the session.
5. For capture Cisco Router or Switches(I tried with Nexus 1000V on VMware vSphere), type ‘show running-config’.

6. Open your session log file(e.g. my_session.log), Cisco Router/Switches running config file are save or backup.

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How to Add Date And Time To Your Bash History on SuSE Linux

Planet Malaysia — Sun, 07 Jun 2009 11:31:05 +0000

The SuSE Linux Enterpise 10 which came together with bash-3.x RPM and HISTORY command show insufficient information(at least for me) as example below:
1 vi /etc/hosts 2 rpm -qa|grep bash 3 cat /etc/SuSE-release 4 history

For any SuSE Linux Enterprise server 10 that managed by more than one people, I would suggest you should make history command more user friendly and more information for auditing purposes.

Edit /etc/bash.bashrc and append to the bottom:
export HISTTIMEFORMAT="%h/%d - %H:%M:%S "
save it.

Open a new SSH session and login as usual, try typing few command and exit. Login again and type history and you should be able to see more useful information which included date and time:
1 Jun/07 - 13:23:40 sudo tail -f /var/log/messages 2 Jun/07 - 13:23:40 cat /etc/hosts 3 Jun/07 - 13:23:40 env |grep DISPLAY 4 Jun/07 - 13:23:40 ps -ef|grep startx 5 Jun/07 - 13:23:40 env 6 Jun/07 - 13:23:40 date 7 Jun/07 - 13:23:40 ps -ef|grep abc 8 Jun/07 - 13:23:40 touch abc 9 Jun/07 - 13:23:40 /sbin/ifconfig 10 Jun/07 - 13:23:40 ping planetmy.com 11 Jun/07 - 13:23:40 cat abc 12 Jun/07 - 13:23:40 date

Note: This HISTTIMEFORMAT is NOT available on SuSE Linux 9 under bash-2.x RPM.

Hope this is helpful!

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How to clean EMC CX 3-80 Dirty Cache?

Planet Malaysia — Wed, 13 May 2009 10:03:20 +0000

For the past weekend, it’s a really a nightmare for me. My office EMC Clariion CX3-80 storage box was crash(halt) and LUNs was not accessible for more than fourty over servers included Asia Pacific and Europe region.

The storage box forced to reset and found dirty cache on certain LUNs. Here I would like to share how to list and clear dirty cache.

List LUNs cache
# cd /opt/Navisphere/bin
./navicli -h 192.168.1.1 luncache -list
OR you can save the output into temporary location.
./navicli -h 192.168.1.1 luncache -list > /tmp/listluncache

Note: IP Address 192.168.1.1 is referring to your SPx controller IP Address.

Open /tmp/listluncache and search for word “YES”
# view /tmp/listluncache

For an example, you will see:
LOGICAL UNIT NUMBER 4912 LUN Offline (Cache Dirty Condition): YES

LOGICAL UNIT NUMBER 4913 LUN Offline (Cache Dirty Condition): YES

Here you can proceed with dirty cache cleaning process.

Note: Please contact EMC support and get the confirmation before do this.

# cd /opt/Navisphere/bin
./navicli -h 192.168.1.1 luncache 4912 -clear -o
AND
./navicli -h 192.168.1.1 luncache 4913 -clear -o

Note: LUNs ID 4912 and 4913 are dirty cache LUNs that require to be clean.

Again, please make sure check with EMC support before proceed. Hope this is helpful!

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Check File Size Command on Linux

Planet Malaysia — Wed, 11 Mar 2009 07:57:37 +0000

The “ls” command is the first command came into the my mind which used for files or directory listing on Linux. Beside that, you can try still check file size on Linux as show below:

ls -l FILENAME|/bin/awk -F” ” ‘{print$5}’
ls -l FILENAME | cut -d ” ” -f 5
du -b FILENAME
stat -c%s FILENAME
cat FILENAME |wc -c

Please let me know if you have better idea.

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How to Modify Linux Kernel Semaphores Parameters

Planet Malaysia — Mon, 02 Mar 2009 03:31:15 +0000

Oracle, DB2 or SAP uses UNIX/Linux resources such as shared memory, swap space, and semaphores extensively for interprocess communication. If the kernel parameters settings are insufficient, you will experience some problems during installation and/or instance startup.

Basically this post will focus on “How to modify Linux Kernel Semaphores parameters”.

Semaphores can best be described as counters which are used to provide synchronization between processes or between threads within a process for shared resources like shared memories. System V semaphores support semaphore sets where each one is a counting semaphore. So when an application requests semaphores, the kernel releases them in “sets”. The number of semaphores per set can be defined through the kernel parameter SEMMSL.

1)Show current SEMAPHORES parameter
server01:~ # ipcs -l

—— Semaphore Limits ——–
max number of arrays = 1024
max semaphores per array = 1250
max semaphores system wide = 256000
max ops per semop call = 100
semaphore max value = 32767

server01:~ # cat /proc/sys/kernel/sem
1250 256000 100 1024

server01:~ # cat /etc/sysctl.conf
kernel.sem = 1250 256000 100 1024

2)How to modify Linux kernel semaphores parameters
server01:~ # vi /etc/sysctl.conf

#search for and change the setting by request
kernel.sem = 4096 512000 1600 9000

Save it and run
server01:~ # sysctl -p /etc/sysctl.conf

3)Show SEMAPHONES parameters
server01:~ # cat /etc/sysctl.conf |grep sem
kernel.sem = 4096 512000 1600 9000

server01:~ # ipcs -l
kernel.sem = 4096 512000 1600 9000
—— Semaphore Limits ——–
max number of arrays = 9000
max semaphores per array = 4096
max semaphores system wide = 512000
max ops per semop call = 1600
semaphore max value = 32767

server01:~ # cat /proc/sys/kernel/sem
4096 512000 1600 9000

Hope this can help!

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Linux Timezone Etc

Planet Malaysia — Wed, 25 Feb 2009 05:58:53 +0000

Referring to my previous post How to configure timezone on SLES Linux, one of my friend asked me how to configure GMT+1 on SuSE Linux.

Some of you may confused and choose Etc -> GMT+1 from YAST or /usr/share/zoneinfo/Etc/GMT+1.

Wrong! Wrong! Wrong! This is definitely wrong. Basically Etc->GMT+1 is referring to UTC/GMT(0) minus 1 hours.

Said for an example, the current time for GMT+1 is 06:50am and UTC/GMT(0) time is 05:50am and you will get 04:50am if you configure Etc->GMT+1 on Linux box.

So you should choose Global – > CET on Linux and if you’re not sure, probably you can refer to GMT+1(UTC+1) country lists here.

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How to set Auto Complete “service” command on Redhat

Planet Malaysia — Mon, 19 Jan 2009 08:36:17 +0000

I have been using SuSE Linux for some time and I love SuSE Linux service script that activated with a symbolic link. In order to start a SSH service, I can easily issue a command “rcsshd start”.

For Redhat or Centos Linux, you’re require to type command such as “service sshd start” and the main problem is NO auto complete for service command by default. Yes I admitted I’m lazy guy!

So how to set AUTO COMPLETE “service” command on Redhat/Centos?

Type:
complete -W "$(ls /etc/init.d/)" service

* complete : the command complete sets up tab completion
* -W : this option creates a word list for completion
* “$(ls /etc/init.d/)” : out word list is made up of the output of the command ls /etc/init.d/
* service : this then sets up the configured completion for the command service

So when you issue a command “service n” and press tab, you should be able to see any services that start with the word “n” within /etc/init.d/ folder such as “ntpd”, “network”, “nfs” and etc.

Enjoy!

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Setup a Linux Highly Availability NFS servers

Planet Malaysia — Mon, 03 Nov 2008 05:48:41 +0000

In this tutorial I will describe how to set up a Linux Highly Availability(HA) NFS servers using SuSE Linux Enterprise Server 10 SP2. In order to make Linux HA NFS failover work, you’re require “sm-notify” utility, basically sm-notify will send out Network Status Monitor(NSM) reboot notifications.

Here are the steps to prepare automated NFS failover.

Server setup details:
Hostname: ServerNFS01
IP Address: 10.10.10.11

Hostname: ServerNFS02
IP Address: 10.10.10.12

Linux HA Virtual Hostname: servernfs01
IP Address 10.10.10.10

NFS Client Hostname NFSclient01
IP Address: 10.10.10.13

Require RPM:
nfs-utils
util-linux
heartbeat
portmap

The /data directory is a Linux HA share drive sitting on /dev/sdb1(ext3) and contains NFS share drive.

Create a new partition using fdisk
# fdisk /dev/sdb

Format /dev/sdb1 as ext3
# mkfs.ext3 /dev/sdb1

Create new folder /data
# mkdir /data

Linux HA configuration file:
#/etc/ha.d/ha.cf
logfile /var/log/ha-log
logfacility local0
node servernfs01
node servernfs02
keepalive 2
warntime 30
deadtime 60
initdead 120
udpport 694
ucast eth0 10.10.10.11
ucast eth0 10.10.10.12
auto_failback off
respawn hacluster /usr/lib/heartbeat/ipfail
watchdog /dev/watchdog

# /etc/ha.d/authkeys
auth 2
2 sha1 NFS_test!

# /etc/ha.d/haresources
servernfs01 10.10.10.10\
Filesystem::/dev/sdb1::/data::ext3 \
service

# cat /etc/ha.d/resource.d/service

# Script START here
# service – Linux HA stop and start script
#

usage(){
#—————————————————————————–
# Spit out usage message
#

cat < USAGE:

$(basename $0) start
$(basename $0) stop
MSG
exit
}

#----------------------------------------------------------------------------
# Main
#

if [ "$(id -u)" != 0 ]; then
echo "Error: Must be root to run this program."
exit
fi

if [ "$#" != 1 ];then
usage
fi

case $1 in
'start')
echo -n Starting NFS . . .
#Restarting NFS server
/etc/init.d/nfsserver restart
#Virtual IP
/sbin/sm-notify -v 10.10.10.10

;;
'stop')
echo -n Stopping NFS . . .
#Stopping NFS server
/etc/init.d/nfsserver stop
#Virtual IP
/sbin/sm-notify -v 10.10.10.10
;;
esac
# Script END here

Virtual IP Address Information:
eth0:0 Link encap:Ethernet HWaddr 00:50:56:BA:7B:CC
inet addr:10.10.10.10 Bcast:10.10.225.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:177 Base address:0x1424

Move existing NFS server files to Linux HA share drive
# mv /var/lib/nfs /data
# mv /etc/exports /data

Create a symbolic link for NFS server
# ln -s /data/nfs /var/lib/nfs
# ln -s /data/exports /etc/exports

# cat /etc/exports
/data 10.10.10.0/255.255.255.0(rw,no_root_squash,no_all_squash,sync)

For ServerNFS01 & ServerNFS02, you’re require
# chkconfig nfsserver off
# chkconfig portmap on
# chkconfig nfsboot off
# chkconfig nfs off
# chkconfig heartbeat on

Please make sure you have NFS services ON for your NFS client machine – NFSclient01
# chkconfig nfs on

Let’s start TESTING ….
1. Login to NFSclient01 and type mkdir /data ; mount -t nfs 10.10.10.10:/data /data
2. Type mount and you should see /data mounted on NFS.
10.10.10.10:/data on /data type nfs (rw,addr=10.10.10.10)
3. Power Off ServerNFS01 immediately.
4. Linux HA will take over by ServerNFS02.
3. Type ifconfig on ServerNFS02 and you should able to see virtual IP address – 10.10.10.10(please wait for a while to see it running).
4. Type /etc/init.d/nfsserver status and you should see NFS server running on node2.
5. Go back to NFSclient01, type ls -l /data or mount and you should see as usual which is mounted on virtual IP address 10.10.10.10 on ServerNFS02.

Congratulations! You’re done!

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