resolve Linux "Too many files open" error

limits.conf

#/etc/security/limits.conf
*         hard    nofile      1024000
*         soft    nofile      1024000
root      hard    nofile      1024000
root      soft    nofile      1024000

sysctl.conf

#/etc/sysctl.conf
fs.file-max = 1024000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.ip_local_port_range = 1024 61000
net.ipv4.tcp_rmem = 4096 32768 262142
net.ipv4.tcp_wmem = 4096 32768 262142
net.core.netdev_max_backlog = 8096
net.core.rmem_default = 262144
net.core.wmem_default = 262144
net.core.rmem_max = 2097152
net.core.wmem_max = 2097152
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 1024
# sudo sysctl -p