nginx所在linux,http访问出现大量超时,调整sysctl.conf中两个参数后恢复正常


[code]
net.nf_conntrack_max = 655360
net.netfilter.nf_conntrack_max = 655350
[/code]

把相关的配置都留存备忘。

open files限制


[code]
# cat /etc/security/limits.conf | grep -v "\#"
* soft nproc 655350
* hard nproc 655350
* soft nofile 655350
* hard nofile 655350
[/code]

内核参数


[code]
# less sysctl.conf | grep -v "\#"
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 262144
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.nf_conntrack_max = 655360
net.netfilter.nf_conntrack_max = 655350
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 10
net.netfilter.nf_conntrack_tcp_timeout_established = 600
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.ip_local_port_range = 1024 65535
[/code]

只有net.ipv4.tcp_timestamps = 1时,net.ipv4.tcp_tw_reuse和net.ipv4.tcp_tw_recycle的配置才有效。

标签: limits, nf_conntrack_max, somaxconn, sysctl

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