Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
How to install bulk packages using yum with groupinstall?
Answer:
Sometimes, if you forgot to select "Development Tools" during Fedora/CentOS installations, you can add them later by using one command
yum groupinstall "Development Tools"
Which save you a lot of times from installing the needed packages one by one.
To see what options are available for groupinstall, try
yum grouplist
How to extract RPM package without installing it
Answer:
Assume you have foo.rpm, type the following command to extract the rpm's contents
rpm2cpio foo.rpm | cpio -idmv
How to turn off SELinux?
Answer: (pick either one)
1. Change the run-time configuration (won't take effect when you reboot)
# sestatus informs you of the two permission mode statuses,
# the current mode in runtime and the mode from the config
# file referenced during boot:
sestatus | grep -i mode
Current mode: enforcing
Mode from config file: enforcing
# Changing the runtime enforcement doesn't effect the
# boot time configuration:
setenforce 1
sestatus | grep -i mode
Current mode: permissive
Mode from config file: enforcing
2. Turn off SELinux permanently, use the following command
system-config-securitylevel
How to check if a rpm package is already installed?
Answer:
To query if a package is installed, e.g.
rpm -q httpd
To display package information, e.g.
rpm -qi httpd
How to compile APC module for PHP
Answer:
The following steps works in RHEL/CentOS
1. Download the latest APC from PECL
wget http://pecl.php.net/get/APC
2. Extract the APC source package and compile/install it
tar -xvf APC
cd APC-X.X.X (replace with your downloaded version)
phpize
./configure
make && make install
3. Enable APC in PHP configuration
echo "extension=apc.so" > /etc/php.d/apc.ini
4. Restart the httpd and use phpinfo() to verify if APC is running
