Redis configuration and make connections maximize

sysctl_99-custom.conf

vm.overcommit_memory=1
net.ipv4.tcp_syncookies=0
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=0
net.ipv4.tcp_fin_timeout=30
net.ipv4.tcp_keepalive_time=1200
net.ipv4.route.gc_timeout=100
net.ipv4.ip_local_port_range=1024 65000
net.ipv4.tcp_syn_retries=5
net.ipv4.tcp_synack_retries=5
net.ipv4.tcp_max_syn_backlog=262144
net.core.netdev_max_backlog=262144
net.core.somaxconn=262144
net.ipv4.tcp_mem=94500000 915000000 927000000