新开ubuntu的必要优化

博主不是专业的运维人员， 有时候新开业务服务器到生产环境忘记配置ubuntu的配置时候，就发生各种奇怪的悲剧比如：
redis出现大量TIMEWAIT状态，并且服务器不会收，原因是tcp_tw_recycle配置为0等等。为避免遗忘记录下新开的服务器必要的操作：

ubuntu网络优化

vi /etc/sysctl.conf

net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_syncookies = 1
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

net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 3
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_keepalive_time = 30
net.ipv4.ip_local_port_range = 2000 65000
net.ipv4.tcp_max_tw_buckets = 6000
net.core.somaxconn = 65535
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.core.somaxconn = 2048

net.ipv4.tcp_mem = 94500000 915000000 927000000

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另一个优化：

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 = 600

net.ipv4.tcp_keepalive_intvl = 30

net.ipv4.tcp_keepalive_probes = 3

net.ipv4.tcp_mem = 786432 1048576 1572864

fs.aio-max-nr = 1048576

fs.file-max = 6815744

kernel.sem = 250 32000 100 128

vm.swappiness = 10

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/sbin/sysctl -p

修改ubuntu打开文件数量

vim /etc/security/limits.conf

root soft nofile 102400
root hard nofile 102400
* soft nofile 102400
* hard nofile 102400

vi /etc/profile

ulimit -SHn 102400