Linux内核优化(未注释)

Nginx代理服务内核优化

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Disable netfilter on bridges.
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

# Controls the default maxmimum size of a mesage queue
kernel.msgmnb = 65536

# Controls the maximum size of a message, in bytes
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
########################################
# set sysctl.conf
net.ipv4.tcp_max_syn_backlog = 65536
net.core.netdev_max_backlog =  32768
net.core.somaxconn = 32768
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_fin_timeout = 5
net.ipv4.tcp_keepalive_time = 120
net.ipv4.tcp_orphan_retries = 1
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 4
net.ipv4.tcp_max_tw_buckets = 1800000
net.netfilter.nf_conntrack_max = 655350
net.netfilter.nf_conntrack_tcp_timeout_established = 1200
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack =1
kernel.pid_max = 65536
net.ipv4.inet_peer_gc_mintime = 10
net.ipv4.ipfrag_time = 30
vm.vfs_cache_pressure = 150
kernel.shmmni = 4096
vm.min_free_kbytes =  204800
vm.dirty_expire_centisecs = 1500
vm.dirty_writeback_centisecs = 200
vm.dirty_ratio = 20
vm.dirty_background_ratio = 10
vm.swappiness = 5
########################################

Nginx Web服务内核优化

#fs.file-max = 102400
vm.swappiness = 0
#net.nf_conntrack_max = 655360
net.netfilter.nf_conntrack_tcp_timeout_established = 1200
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_recycle = 0
#net.ipv4.tcp_tw_reuse = 1
#net.ipv4.tcp_timestamps = 0
#net.ipv4.tcp_max_syn_backlog = 200000
#net.ipv4.tcp_max_tw_buckets = 5000
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.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_syn_retries = 1
#net.ipv4.tcp_fin_timeout = 1
net.ipv4.ip_local_port_range = 1024 65535
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.core.somaxconn = 262144
#net.ipv4.tcp_keepalive_time = 1200

Sysctl.conf

# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
#net.ipv4.ip_forward = 0

# Controls source route verification
#net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
#net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
#kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multi-threaded applications
#kernel.core_uses_pid = 1

# Controls the use of TCP syncookies
#net.ipv4.tcp_syncookies = 1

# Controls the maximum size of a message, in bytes
#kernel.msgmnb = 65536

# Controls the default maxmimum size of a mesage queue
#kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
#kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
#kernel.shmall = 4294967296

net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
kernel.threads-max=65535
kernel.msgmni = 16384
kernel.msgmnb = 65535
kernel.msgmax = 65535
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
kernel.shmmni = 4096
kernel.sem = 5010 641280 5010 128
net.ipv4.tcp_max_tw_buckets = 20000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
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 = 32768
net.ipv4.tcp_no_metrics_save = 1
net.core.somaxconn = 32768
net.core.optmem_max = 10000000
net.ipv4.tcp_max_orphans = 32768
net.ipv4.tcp_max_syn_backlog = 32768
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes=10
net.ipv4.tcp_keepalive_intvl=2
net.ipv4.ip_local_port_range = 10000 65535
net.ipv4.route.gc_timeout = 100
net.ipv4.tcp_congestion_control=cubic
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
fs.aio-max-nr = 1024000
fs.file-max = 1024000
vm.swappiness = 0