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centos 7 disable useless services

January 4th, 2017 Leave a comment Go to comments

This some of the tuning I do on a centos 7 install

REMOVE USLESS NETWORK INTERFACE
brctl delbr virbr0
systemctl get-default
systemctl set-default multi-user.target

DISABLE USELESS SERVICES
ON GUI INSTALLS:
systemctl disable polkit.service libstoragemgmt.service avahi-daemon.service rhnsd.service alsa-state.service wpa_supplicant.service gssproxy.service ModemManager.service irqbalance.service atd.service smartd.service abrt-xorg.service abrtd.service cups.service
systemctl stop polkit.service libstoragemgmt.service avahi-daemon.service rhnsd.service alsa-state.service wpa_supplicant.service gssproxy.service ModemManager.service irqbalance.service atd.service smartd.service abrt-xorg.service abrtd.service cups.service
ON BASIC WEB INSTALLS:
systemctl disable firewalld.service irqbalance.service abrtd.service polkit.service smartd.service wpa_supplicant.service atd.service
systemctl stop firewalld.service irqbalance.service abrtd.service polkit.service smartd.service wpa_supplicant.service atd.service
mv /usr/sbin/wpa_supplicant /usr/sbin/wpa_supplicant_REMOVED
pkill wpa_supplicant

systemctl list-units –type service |grep running

RENAME NETWORK INTERFACE
mv /etc/sysconfig/network-scripts/ifcfg-eno16777984 /etc/sysconfig/network-scripts/ifcfg-eth0
vi /etc/default/grub
GRUB_CMDLINE_LINUX=”crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet nr_cups=2 net.ifnames=0 biosdevname=0v ”
grub2-mkconfig -o /boot/grub2/grub.cfg

sed -i ‘s/enforcing/disabled/g’ /etc/selinux/config
sestatus
#NEED REBOOT

DISABLE IPV6
cat /etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_FAILURE_FATAL=no
NAME=eth0
UUID=0271b1ee-6a44-4ad6-a832-eadde5fe844d
DEVICE=eth0
ONBOOT=yes
HWADDR=00:50:56:A7:2D:EC
IPADDR=172.27.33.99
PREFIX=24
GATEWAY=172.27.33.231
IPV6_PEERDNS=no
IPV6_PEERROUTES=no

TOO MANY RCUOS PROCESS
Turn off the vm.
Edit settings > Options > Advanced > Memory / CPU Hotplug
In “CPU Hot Plug”, disable “CPU hot plug for this virtual machine.”
Power on.

here is the script:

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