Common Linux system optimization scripts

#!/bin/sh # 服务优化,（sshd、network、crond、syslog、rsyslog）服务保持默认开机启动 ServiceList=$(chkconfig --list |  grep ‘0‘ |  awk ‘{print $1}‘ |  grep -Ev  ‘sshd|network|crond|syslog‘ ) for Service  in $ServiceList do      /etc/init .d/$Service stop      chkconfig --level 0123456 $Service off done # 内核参数调优 grep -q  "vm.swappiness = 0" /etc/sysctl .conf ||  cat >>  /etc/sysctl .conf << EOF ######################################## vm.swappiness = 0 net.core.rmem_default = 262144 net.core.rmem_max = 16777216 net.core.wmem_default = 262144 net.core.wmem_max = 16777216 net.core.somaxconn = 262144 net.core.netdev_max_backlog = 262144 net.ipv4.tcp_max_orphans = 262144 net.ipv4.tcp_max_syn_backlog = 262144 net.ipv4.tcp_max_tw_buckets = 10000 net.ipv4.ip_local_port_range = 1024 65500 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp_keepalive_time = 1200 net.ipv4.tcp_mem = 786432 1048576 1572864 fs.aio-max-nr = 1048576 fs. file -max = 6815744 kernel.sem = 250 32000 100 128 fs.inotify.max_user_watches = 1048576 EOF sysctl -p grep -q  "* - nofile 65536" /etc/security/limits .conf ||  cat >>  /etc/security/limits .conf << EOF ######################################## * - nofile 1048576 * - nproc  65536 * - stack  1024 EOF grep -q  "ulimit -n 65536" /etc/profile ||  cat >>  /etc/profile << EOF ######################################## ulimit -n 1048576 ulimit -u 65536 ulimit -s 1024 alias grep = ‘grep --color=auto‘ export HISTTIMEFORMAT= "%Y-%m-%d %H:%M:%S " EOF # 禁用并关闭selinux sed -i  ‘s/SELINUX=enforcing/SELINUX=disabled/‘ /etc/selinux/config setenforce 0 # 优化SSH sed -i  ‘s/.*UseDNS yes/UseDNS no/‘ /etc/ssh/sshd_config sed -i  ‘s/.*GSSAPIAuthentication yes/GSSAPIAuthentication no/‘ /etc/ssh/sshd_config /etc/init .d /sshd restart # 脚本目录加入PATH环境变量 grep -q  "/App/script" $HOME/.bash_profile ||  cat >> $HOME/.bash_profile << EOF ######################################## export PATH= /App/script :\$PATH EOF mkdir -p  /App/script /App/src # 挂载tmpfs文件系统 mount --bind  /dev/shm /tmp grep -q  "/dev/shm" /etc/rc . local ||  echo "/bin/mount --bind /dev/shm /tmp" >>  /etc/rc . local

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Common Linux system optimization scripts