调优方法与目的:
1. 编辑sysctl.conf
复制代码代码如下:
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200 net.ipv4.route.gc_timeout = 100 net.ipv4.ip_local_port_range = 1024 65000 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_syn_retries = 1 net.ipv4.tcp_synack_retries = 1 net.ipv4.tcp_max_syn_backlog = 262144 net.core.netdev_max_backlog = 262144 net.core.somaxconn = 262144 net.ipv4.tcp_mem = 94500000 915000000 927000000 保存退出
2. sudo /sbin/sysctl -p
复制代码代码如下:
netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}’
cat /proc/net/sockstat 3. 查看是否有异常日志:dmesg 4. 查看当前IP个数和每IP连接数:
复制代码代码如下:
netstat -an | grep 80 | awk ‘{print $5}’ | awk ‘BEGIN {FS=”:”} NF==2 {print $1} NF==5 {print $4}’ | sort | uniq -c | sort -n
默认值恢复:
复制代码代码如下:
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_keepalive_time = 7200 net.ipv4.route.gc_timeout = 300 net.ipv4.ip_local_port_range = 32768 61000 net.ipv4.tcp_tw_reuse = 0 net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_syn_retries = 5 net.ipv4.tcp_synack_retries = 5 net.ipv4.tcp_max_syn_backlog = 1024 net.core.netdev_max_backlog = 1000 net.core.somaxconn = 128 net.ipv4.tcp_mem = 853440 1137920 1706880 以上配置在实际生产环境中单机1.7w连接数情况下nginx工作正常。 (责任编辑:IT) |