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[CentOS 7.0] Change the default “enxx” network device to old “eth0” on CentOS 7 The easiest way to restore the old way Kernel/modules/udev rename your ethernet interfaces is supplying these kernel parameters to CentOS 7: net.ifnames=0 biosdevname=0 To do so follow this steps: Edit /etc/default/grub At the end of GRUB_CMDLINE_LINUX line append “net.ifnames=0 biosdevname=0” Save […] [CentOS 7.0] Configure Networking [1] Set static IP address to the server. ( Replace the section ‘ifcfg-***’ to your own interface name ) # install the package below which includes ifconfig, netstat and so on first [root@dlp ~]#yum -y install net-tools [root@dlp ~]#vi /etc/sysconfig/network-scripts/ifcfg-eno16777736 HWADDR=”00:0C:29:CD:9C:2D” TYPE=”Ethernet” # change BOOTPROTO=”none” DEFROUTE=”yes” PEERDNS=”yes” PEERROUTES=”yes” IPV4_FAILURE_FATAL=”no” IPV6INIT=”yes” IPV6_AUTOCONF=”yes” […] [CentOS 7.0] Change RunLevel [1] RunLevel is set with linking to /etc/systemd/system/default.target. For example, the default setting without GUI is like follows. # show current setting [root@dlp ~]#systemctl get-default multi-user.target [root@dlp ~]#ll /etc/systemd/system/default.target lrwxrwxrwx. 1 root root 37 Jul 9 06:04 /etc/systemd/system/default.target -> /lib/systemd/system/multi-user.target [2] For example, if you’d like to change the RunLevel to […] [CentOS 7.0] Configure Services [1] Configure Services of the System. # list services which are booted (list all includes inactive one with “–all” option) [root@dlp ~]#systemctl -t service UNIT LOAD ACTIVE SUB DESCRIPTION auditd.service loaded active running Security Auditing Service avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack crond.service loaded active running Command Scheduler dbus.service loaded […] MySQL : interactive_timeout v/s wait_timeout Most of the database intensive applications are working about the default values of these variables obviously. Developers used to inform me that they need to extend the wait_timeout value in order to complete the query execution. After some googling, it is found that default “wait_timeout” value is good enough. […] How and Why You Should Change MySQL’s wait_timeout and interactive_timeout Variables wait_timeout variable represents the amount of time that MySQL will wait before killing an idle connection. The default wait_timeout variable is 28800 seconds, which is 8 hours. That’s a lot. I’ve read in different forums/blogs that putting wait_timeout too low (e.g. 30, 60, 90) […] |
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