linux 系统参数优化

sysctl.con

# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
net.ipv6.conf.eth0.accept_dad = 0
net.ipv6.conf.eth0.accept_ra = 1
net.ipv6.conf.eth0.accept_ra_defrtr = 1
net.ipv6.conf.eth0.accept_ra_rtr_pref = 1
net.ipv6.conf.eth0.accept_ra_rt_info_max_plen = 1
vm.swappiness=0
net.ipv4.neigh.default.gc_stale_time=120
# see details in https://help.aliyun.com/knowledge_detail/39428.html
net.ipv4.conf.all.rp_filter=0
net.ipv4.conf.default.rp_filter=0
net.ipv4.conf.default.arp_announce=2
net.ipv4.conf.lo.arp_announce=2
net.ipv4.conf.all.arp_announce=2
# see details in https://help.aliyun.com/knowledge_detail/41334.html
net.ipv4.tcp_max_tw_buckets=5000
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_max_syn_backlog=1024
net.ipv4.tcp_synack_retries=2
net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.lo.disable_ipv6=1
kernel.sysrq=1
vm.max_map_count=262144
net.nf_conntrack_max=1048576
net.netfilter.nf_conntrack_max=1048576
net.bridge.bridge-nf-call-iptables=1

limit.cof

cat <<EOF>>/etc/security/limits.conf
root soft nofile 65535
root hard nofile 65535
* soft nofile 65535
* hard nofile 65535
* soft nproc 65535
* hard nproc 65535
* soft core 0
* hard core 0
* soft stack unlimited
* hard stack unlimited
* soft memlock unlimited
* hard memlock unlimited
EOF