一、环境
Centos 7.8
二、关闭numa和透明大页
[root@dragon01 pgsql]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_disTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_disABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="spectre_v2=retpoline rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet numa=off transparent_hugepage=never ipv6.disable=1" GRUB_disABLE_RECOVERY="true" [root@dragon01 pgsql]# grub2-mkconfig -o /etc/grub2.cfg --重新生成启动配置文件 [root@dragon01 pgsql]# reboot --重启生效 [root@dragon01 pgsql]# dmesg | grep -i numa --验证1 [root@dragon01 pgsql]# cat /proc/cmdline --验证2
三、配置kernel参数
# Database kernel optimisation fs.aio-max-nr = 1048576 # 限制并发未完成的异步请求数目，，不应小于1M fs.file-max = 16777216 # 最大打开16M个文件 # kernel kernel.shmmax = 485058 # 共享内存最大页面数量: $(expr $(getconf _PHYS_PAGES) / 2) kernel.shmall = 1986797568 # 共享内存总大小： $(expr $(getconf _PHYS_PAGES) / 2 \* $(getconf PAGE_SIZE)) kernel.shmmni = 16384 # 系统范围内共享内存段的最大数量 4096 -> 16384 kernel.msgmni = 32768 # 系统的消息队列数目,影响可以启动的代理程序数 设为内存MB数 kernel.msgmnb = 65536 # 影响队列的大小 kernel.msgmax = 65536 # 影响队列中可以发送的消息的大小 kernel.numa_balancing = 0 # Numa禁用 kernel.sched_migration_cost_ns = 5000000 # 5ms内，调度认为进程还是Hot的。 kernel.sem = 2048 134217728 2048 65536 # 每个信号集最大信号量2048，系统总共可用信号量134217728，单次最大操作2048，信号集总数65536 # vm vm.dirty_ratio = 80 # 绝对限制，超过80%阻塞写请求刷盘 vm.dirty_background_bytes = 268435456 # 256MB脏数据唤醒刷盘进程 vm.dirty_expire_centisecs = 6000 # 1分钟前的数据被认为需要刷盘 vm.dirty_writeback_centisecs= 500 # 刷新进程运行间隔5秒 vm.mmap_min_addr = 65536 # 禁止访问0x10000下的内存 vm.zone_reclaim_mode = 0 # Numa禁用 # vm swap vm.swappiness = 0 # 禁用SWAP，但高水位仍会有 vm.overcommit_memory = 2 # 允许一定程度的Overcommit vm.overcommit_ratio = 50 # 允许的Overcommit:$((($mem - $swap) * 100 / $mem)) # tcp memory net.ipv4.tcp_rmem = 8192 65536 16777216 # tcp读buffer: 32M/256M/16G net.ipv4.tcp_wmem = 8192 65536 16777216 # tcp写buffer: 32M/256M/16G net.ipv4.tcp_mem = 131072 262144 16777216 # tcp 内存使用 512M/1G/16G net.core.rmem_default = 262144 # 接受缓冲区默认大小: 256K net.core.rmem_max = 4194304 # 接受缓冲区最大大小: 4M net.core.wmem_default = 262144 # 发送缓冲区默认大小: 256K net.core.wmem_max = 4194304 # 发送缓冲区最大大小: 4M # tcp keepalive net.ipv4.tcp_keepalive_intvl = 20 # 探测没有确认时，重新发送探测的频度。默认75s -> 20s net.ipv4.tcp_keepalive_probes = 3 # 3 * 20 = 1分钟超时断开 net.ipv4.tcp_keepalive_time = 60 # 探活周期1分钟 # tcp port resure net.ipv4.tcp_tw_reuse = 1 # 允许将TIME_WAIT socket用于新的TCP连接。默认为0 net.ipv4.tcp_tw_recycle = 0 # 快速回收，已弃用 net.ipv4.tcp_fin_timeout = 5 # 保持在FIN-WAIT-2状态的秒时间 net.ipv4.tcp_timestamps = 1 # tcp anti-flood net.ipv4.tcp_syncookies = 1 # SYN_RECV队列满后发cookie，防止恶意攻击 net.ipv4.tcp_synack_retries = 1 # 收到不完整sync后的重试次数 5->2 net.ipv4.tcp_syn_retries = 1 #表示在内核放弃建立连接之前发送SYN包的数量。 # tcp load-balancer net.ipv4.ip_forward = 1 # IP转发 net.ipv4.ip_nonlocal_bind = 1 # 绑定非本机地址 net.netfilter.nf_conntrack_max = 1048576 # 最大跟踪连接数 net.ipv4.ip_local_port_range = 10000 65535 # 端口范围 net.ipv4.tcp_max_tw_buckets = 262144 # 256k TIME_WAIT net.core.somaxconn = 65535 # 限制LISTEN队列最大数据包量，触发重传机制。 net.ipv4.tcp_max_syn_backlog = 8192 # SYN队列大小：1024->8192 net.core.netdev_max_backlog = 8192 # 网卡收包快于内核时，允许队列长度
optimize() {
if (( "$#" == 1 )); then
local datadir="$1"; shift
local mem="$(free \
| awk '/Mem:/{print $2}')"
local swap="$(free \
| awk '/Swap:/{print $2}')"
cat > /etc/sysctl.conf <<- EOF
# Database kernel optimisation
fs.aio-max-nr = 1048576
fs.file-max = 76724600
kernel.sem = 4096 2147483647 2147483646 512000
kernel.shmmax = $(( $mem * 1024 / 2 ))
kernel.shmall = $(( $mem / 5 ))
kernel.shmmni = 819200
net.core.netdev_max_backlog = 10000
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 4194304
net.core.somaxconn = 4096
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_keepalive_intvl = 20
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_mem = 8388608 12582912 16777216
net.ipv4.tcp_fin_timeout = 5
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_tw_buckets = 262144
net.ipv4.tcp_rmem = 8192 87380 16777216
net.ipv4.tcp_wmem = 8192 65536 16777216
vm.dirty_background_bytes = 409600000
net.ipv4.ip_local_port_range = 40000 65535
vm.dirty_expire_centisecs = 6000
vm.dirty_ratio = 80
vm.dirty_writeback_centisecs = 50
vm.extra_free_kbytes = 4096000
vm.min_free_kbytes = 2097152
vm.mmap_min_addr = 65536
vm.swappiness = 0
vm.overcommit_memory = 2
vm.overcommit_ratio = $(( ( $mem - $swap ) * 100 / $mem ))
vm.zone_reclaim_mode = 0
EOF
sysctl -p
}
fi
四、配置资源限制
cat > /etc/security/limits.d/postgresql.conf <<- EOF postgres soft nproc 655360 postgres hard nproc 655360 postgres hard nofile 655360 postgres soft nofile 655360 postgres soft stack unlimited postgres hard stack unlimited postgres soft core unlimited postgres hard core unlimited postgres soft memlock 250000000 postgres hard memlock 250000000 EOF cat > /etc/security/limits.d/pgbouncer.conf <<- EOF pgbouncer soft nproc 655360 pgbouncer hard nofile 655360 pgbouncer soft nofile 655360 pgbouncer soft stack unlimited pgbouncer hard stack unlimited pgbouncer soft core unlimited pgbouncer hard core unlimited pgbouncer soft memlock 250000000 pgbouncer hard memlock 250000000 EOF cat > /etc/security/limits.d/pgpool.conf <<- EOF pgpool soft nproc 655360 pgpool hard nofile 655360 pgpool soft nofile 655360 pgpool soft stack unlimited pgpool hard stack unlimited pgpool soft core unlimited pgpool hard core unlimited pgpool soft memlock 250000000 pgpool hard memlock 250000000 EOF
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