more /etc/apt/sources.list
# deb cdrom:[Ubuntu-Server 18.04 LTS _Trusty Tahr_ - Prd amd64]/ bionic main restricted
deb [ arch=amd64 ] http://ubuntu.prd.uledns.com/ubuntu/ bionic main restricted universe multiverse
deb [ arch=amd64 ] http://ubuntu.prd.uledns.com/ubuntu/ bionic-security main restricted universe multiverse
deb [ arch=amd64 ] http://ubuntu.prd.uledns.com/ubuntu/ bionic-updates main restricted universe multiverse
deb [ arch=amd64 ] http://ubuntu.prd.uledns.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb [ arch=amd64 ] http://ubuntu.prd.uledns.com/ubuntu/ bionic-backports main restricted universe multiverse

#最大文件数限制
echo "*    soft    nofile    65536" >>/etc/security/limits.conf
echo "*    hard    nofile    65536" >>/etc/security/limits.conf
#提升文件系统IO性能
sed -i '/LABEL=cloudimg-rootfs/s/defaults/defaults,nodiratime,noatime,nobarrier/' /etc/fstab
echo 5 > /proc/sys/vm/dirty_background_ratio
echo 10 > /proc/sys/vm/dirty_ratio

more /etc/sysctl.conf
net.ipv4.ip_forward = 0
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096        87380   4194304
net.ipv4.tcp_wmem = 4096        16384   4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 30
fs.file-max = 655360
net.ipv4.tcp_sack = 0
net.ipv4.ip_local_port_range = 30000    65000
net.ipv4.conf.default.rp_filter = 0
net.core.optmem_max = 65535
vm.swappiness = 0
kernel.pid_max = 65534
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1