基于hadoop集群中的linux内核优化
1、禁用swap
cat /etc/sysctl.conf
vm.swappiness = 0
sysctl -p 生效
swapoff -a 永久关闭swap
swapon -a 永久开启swap
默认值30,值越大用到swap概率就增加。虚拟机内存大于2G的默认建议配置5或更低。
2、内核优化
cat < /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 vm.swappiness = 0 net.ipv4.neigh.default.gc_stale_time = 120 net.ipv4.conf.all.rp_filter = 0 net.ipv4.conf.default.rp_filter = 0 net.ipv4.conf.default.arp_announce = 2 net.ipv4.conf.lo.arp_announce = 2 net.ipv4.conf.all.arp_announce = 2 net.ipv4.tcp_max_tw_buckets = 5000 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_max_syn_backlog = 1024 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_rmem = 8192 262144 4096000 net.ipv4.tcp_wmem = 4096 262144 4096000 net.ipv4.tcp_max_orphans = 300000 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.ip_local_port_range = 1025 65535 net.ipv4.tcp_max_syn_backlog = 100000 net.ipv4.tcp_fin_timeout = 30 net.ipv4.tcp.keepalive_time = 1200 net.ipv4.tcp_max_tw_buckets = 5000 net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 1500 kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.sysrq = 1 net.ipv4.icmp_echo_ignore_all = 0 net.ipv4.tcp_max_orphans = 3276800 fs.file-max = 800000 net.core.somaxconn=32768 net.core.rmem_default = 12697600 net.core.wmem_default = 12697600 net.core.rmem_max = 873800000 net.core.wmem_max = 655360000 EOF
sysctl -p 生效
更多精彩