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sysctl.conf
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fs.file-max = 999999
net.core.rmem_default = 256960
net.core.rmem_max = 513920
net.core.wmem_default = 256960
net.core.wmem_max = 513920
net.core.netdev_max_backlog = 2000
net.core.somaxconn = 2048
net.core.optmem_max = 81920
net.ipv4.tcp_mem = 131072 262144 524288
net.ipv4.tcp_rmem = 8760 256960 4088000
net.ipv4.tcp_wmem = 8760 256960 4088000
net.ipv4.tcp_keepalive_time = 1800
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_max_orphans = 999999
net.ipv4.tcp_max_tw_buckets = 999999
net.ipv4.ip_conntrack_max = 25000000
net.ipv4.netfilter.ip_conntrack_max = 25000000
net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 180
net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait = 120
net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait = 60
net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait = 120