Debian 10 secure and speed for PLESK controll panel

nano  /etc/security/limits.conf

nginx   soft    nofile  65536
nginx   hard    nofile  65536

sysctl config:

fs.aio-max-nr = 524288
fs.file-max = 611160
kernel.msgmax = 131072
kernel.msgmnb = 131072
kernel.panic = 15
kernel.pid_max = 65536
kernel.printk = 4 4 1 7
kernel.sysrq = 0
net.core.default_qdisc = fq
net.core.netdev_max_backlog = 262144
net.core.optmem_max = 16777216
net.core.rmem_max = 16777216
net.core.somaxconn = 65535
net.core.wmem_max = 16777216
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.secure_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.ip_forward = 0
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_congestion_control = bbr
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_low_latency = 1
net.ipv4.tcp_max_orphans = 10000
net.ipv4.tcp_max_syn_backlog = 65000
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_notsent_lowat = 16384
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_sack = 0
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
vm.dirty_background_ratio = 2
vm.dirty_ratio = 60
vm.max_map_count = 262144
vm.overcommit_memory = 1
vm.swappiness = 1
# Avoid a smurf attack
net.ipv4.icmp_echo_ignore_broadcasts = 1
# Turn on protection for bad icmp error messages
net.ipv4.icmp_ignore_bogus_error_responses = 1
# Turn on execshild
kernel.exec-shield = 1
kernel.randomize_va_space = 1
 
# Tuen IPv6
net.ipv6.conf.default.router_solicitations = 0
net.ipv6.conf.default.accept_ra_rtr_pref = 0
net.ipv6.conf.default.accept_ra_pinfo = 0
net.ipv6.conf.default.accept_ra_defrtr = 0
net.ipv6.conf.default.autoconf = 0
net.ipv6.conf.default.dad_transmits = 0
net.ipv6.conf.default.max_addresses = 1
 
# Optimization for port usefor LBs
# Increase system file descriptor limit
fs.file-max = 65535
 
# Allow for more PIDs (to reduce rollover problems); may break some programs 32768
kernel.pid_max = 65536

Interface settings:

ethtool -G ens192 rx 2048 tx 2048
/sbin/ifconfig ens192 txqueuelen 10000

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