Linux kernel optimization related shell script

#修改 some of the default configurations in the/etc/sysctl.conf file
if [ grep -v "^\s*#" /etc/sysctl.conf|grep -c "net.ipv4.ip_forward\s\+=\+0"];then
Cat >>/etc/sysctl.conf << EOF
Net.ipv4.ip_forward = 0
Net.ipv4.tcp_max_tw_buckets = 5000
Fs.file-max = 65535
Net.ipv4.ip_local_port_range = 1024 65000
Net.ipv4.tcp_syncookies = 1
Vm.overcommit_memory = 1
Net.ipv4.tcp_fin_timeout = 1
Net.ipv4.tcp_keepalive_time = 1200
Net.ipv4.tcp_mem = 94500000 915000000 927000000
Net.ipv4.tcp_tw_reuse = 1
Net.ipv4.tcp_tw_recycle = 1
Net.ipv4.tcp_timestamps = 0
Net.ipv4.tcp_synack_retries = 1
Net.ipv4.tcp_syn_retries = 1
Net.ipv4.tcp_abort_on_overflow = 0
Net.core.rmem_max = 16777216
Net.core.wmem_max = 16777216
Net.core.netdev_max_backlog = 262144
Net.core.somaxconn = 65535
vm.max_map_count=655360
Net.ipv4.tcp_max_orphans = 3276800
Net.ipv4.tcp_max_syn_backlog = 262144
Net.core.wmem_default = 8388608
Net.core.rmem_default = 8388608
Eof
Sysctl-p #effective
Fi
Number of files #修改open
if [ grep -v ‘^\s*#‘ /etc/security/limits.conf |grep -c ‘soft nofile‘-eq 0];then
Cat >>/etc/security/limits.conf <<eof

• Soft Nofile 65535
• Hard Nofile 65535
  Eof
  ULIMIT-HSN 65535
  Fi

If [ grep -v ‘^\s*#‘ /etc/security/limits.d/20-nproc.conf |grep -c ‘soft nofile‘ -eq 0];then
Rm-rf/etc/security/limits.d/20-nproc.conf
CP $PACKAGE _dir/20-nproc.conf/etc/security/limits.d/
Fi

If [ grep -v ‘^\s*#‘ /etc/systemd/system.conf |grep -c ‘DefaultLimitCORE=infinity‘ -eq 0];then
Cat >>/etc/systemd/system.conf <<eof

Defaultlimitcore=infinity
defaultlimitnofile=100000
defaultlimitnproc=100000

Eof

Fi

If [ grep -v ‘^\s*#‘ /etc/systemd/user.conf |grep -c ‘DefaultLimitCORE=infinity‘ -eq 0];then
Cat >>/etc/systemd/user.conf <<eof

Defaultlimitcore=infinity
defaultlimitnofile=100000
defaultlimitnproc=100000

Eof

Linux kernel optimization related shell script