Quick HOWTO: View contents of RPM without installing it

In Linux, You may wonder what are the files inside a rpm package and you may want to check them before installing it.

You can do this with the below rpm commands:

If the rpm file available locally:
[[email protected]_server1 ~]# rpm -qlp telnet-0.17-48.el6.x86_64.rpm
/usr/bin/telnet
/usr/share/man/man1/telnet.1.gz
[[email protected]_server1 ~]#

[[email protected]_server1 ~]# rpm -q -filesbypkg -p numactl-devel-2.0.9-2.el6.x86_64.rpm
numactl-devel             /usr/include/numa.h
numactl-devel             /usr/include/numacompat1.h
numactl-devel             /usr/include/numaif.h
numactl-devel             /usr/lib64/libnuma.a
numactl-devel             /usr/lib64/libnuma.so
[[email protected]_server1 ~]#

If you want to check the contents of a rpm located in a remote repository:
[[email protected]_server1 ~]# repoquery --list telnet
/usr/bin/telnet
/usr/share/man/man1/telnet.1.gz
[[email protected]_server1 ~]#

If you want to check the pre installation and post installation scripts which runs while you installing a rpm package.
[[email protected]_server1 ~]# rpm -qp --scripts sysstat-9.0.4-33.el6.x86_64.rpm
postinstall scriptlet (using /bin/sh):
/sbin/chkconfig --add sysstat
preuninstall scriptlet (using /bin/sh):
if [ "$1" = 0 ]; then
  # Remove sa logs if removing sysstat completely
  rm -f /var/log/sa/*
  # Remove service
  /sbin/chkconfig --del sysstat
fi
[[email protected]_server1 ~]#

If the rpm is already installed, you can use same commands without passing the arguement "-p".

Example:
rpm -ql sysstat-9.0.4-33.el6.x86_64
rpm -q --scripts sysstat-9.0.4-33.el6.x86_64


If you want to extract the rpm contents without installing it.
[email protected]_server1~]# rpm2cpio telnet-0.17-48.el6.x86_64.rpm | cpio -idmv
./usr/bin/telnet
./usr/share/man/man1/telnet.1.gz
220 blocks

Quick HOWTO: Pacemaker Cluster on Redhat Linux - Enable Web GUI Interface

  
You will notice that your PCS web interface is not working after your pacemaker cluster installation. Because it is not enabled by default. Here is the steps to enable it.

cd /usr/lib/pcsd
vi pcsd.rb
search for "DISABLE_GUI=true"
edit that line to "DISABLE_GUI=false"
service pcsd restart

Now you will be able to access the pacemaker web interface as below:

https://<yourpacemakerclusterserver>:2224