300 lines
9.2 KiB
Text
300 lines
9.2 KiB
Text
# Webinoly (This configuration file is only for internal use)
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#####################################################################################################
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# Please, DO NOT MODIFY this file, all the changes will be lost. #
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# If you need to add/modify any of the existing rules, here: /etc/sysctl.conf #
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# Please, read the documentation: https://webinoly.com/documentation/ #
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#####################################################################################################
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#######################################
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### GENERAL SYSTEM SECURITY OPTIONS ###
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#######################################
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# Maximum number of files the kernel can be allocated
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fs.file-max = 9223372036854775807
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# Maximum number of files that can be assigned a single process
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fs.nr_open = 2147483584
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# Maximum number of asynchronous I/O requests
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fs.aio-max-nr = 18446744073709551615
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# Controls the System Request debugging functionality of the kernel
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kernel.sysrq = 0
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# Controls whether core dumps will append the PID to the core filename.
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# Useful for debugging multi-threaded applications.
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kernel.core_uses_pid = 1
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#Allow for more PIDs
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kernel.pid_max = 4194304
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# Address space layout randomization (ASLR)
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kernel.randomize_va_space = 2
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# Controls the maximum size of a message, in bytes
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kernel.sem = 32000 1024000000 500 32000
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kernel.msgmni = 16384
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kernel.msgmax = 65535
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kernel.msgmnb = 65535
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# Restrict core dumps
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fs.suid_dumpable = 0
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# Restrict access to kernel logs
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kernel.dmesg_restrict = 1
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# Hide exposed kernel pointers
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kernel.kptr_restrict = 1
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# Sets the time before the kernel considers migrating a proccess to another core
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# This variable is no longer in sysctl, moved to: /sys/kernel/debug/sched/migration_cost_ns
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#kernel.sched_migration_cost_ns = 5000000
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# Group tasks by TTY
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kernel.sched_autogroup_enabled = 0
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########################################
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### IMPROVE SYSTEM MEMORY MANAGEMENT ###
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########################################
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# Do less swapping
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vm.swappiness = 10
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vm.dirty_ratio = 50
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vm.dirty_background_ratio = 5
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vm.dirty_expire_centisecs = 1400
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# Only for ram > 28G
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#vm.dirty_bytes = 5505024000
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#vm.dirty_background_bytes = 917504000
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#vm.dirty_writeback_centisecs = 100
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# specifies the minimum virtual address that a process is allowed to mmap
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vm.mmap_min_addr = 65535
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# 50% overcommitment of available memory
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vm.overcommit_ratio = 50
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vm.overcommit_memory = 0
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# Set maximum amount of memory allocated to shm
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kernel.shmall = 4294967296
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kernel.shmmax = 68719476736
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kernel.shmmni = 4096
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# Keep at least 64MB of free RAM space available
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vm.min_free_kbytes = 65535
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# Vitual memory
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vm.max_map_count = 262144
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# Disable reclaim memory when a zone runs out of memory.
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vm.zone_reclaim_mode = 0
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########################################
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### GENERAL NETWORK SECURITY OPTIONS ###
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########################################
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#Prevent SYN attack, enable SYNcookies (they will kick-in when the max_syn_backlog reached)
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net.ipv4.tcp_syncookies = 1
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net.ipv4.tcp_max_syn_backlog = 65535
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# Never decrease these 'retries' values
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net.ipv4.tcp_syn_retries = 6
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net.ipv4.tcp_synack_retries = 5
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# Disables packet forwarding
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net.ipv4.ip_forward = 0
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net.ipv4.conf.all.forwarding = 0
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#net.ipv4.conf.all.mc_forwarding = 0
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net.ipv4.conf.default.forwarding = 0
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net.ipv6.conf.all.forwarding = 0
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#net.ipv6.conf.all.mc_forwarding = 0
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net.ipv6.conf.default.forwarding = 0
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# Disables IP source routing
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv6.conf.all.accept_source_route = 0
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net.ipv6.conf.default.accept_source_route = 0
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# Disable ICMP Redirect Acceptance
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.secure_redirects = 0
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net.ipv4.conf.default.secure_redirects = 0
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net.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.default.accept_redirects = 0
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# Deny Router Solicitations
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net.ipv6.conf.all.router_solicitations = 0
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net.ipv6.conf.default.router_solicitations = 0
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net.ipv6.conf.all.accept_ra_rtr_pref = 0
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net.ipv6.conf.default.accept_ra_rtr_pref = 0
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net.ipv6.conf.all.accept_ra_pinfo = 0
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net.ipv6.conf.default.accept_ra_pinfo = 0
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net.ipv6.conf.all.accept_ra_defrtr = 0
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net.ipv6.conf.default.accept_ra_defrtr = 0
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net.ipv6.conf.all.dad_transmits = 0
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net.ipv6.conf.default.dad_transmits = 0
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# Enable IP spoofing protection, turn on source route verification
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.default.rp_filter = 1
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# Enable Log Spoofed Packets, Source Routed Packets, Redirect Packets
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net.ipv4.conf.all.log_martians = 1
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net.ipv4.conf.default.log_martians = 1
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# Decrease the time default value for tcp_fin_timeout connection
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net.ipv4.tcp_fin_timeout = 7
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# Decrease the time default value for connections to keep alive
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net.ipv4.tcp_keepalive_time = 90
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net.ipv4.tcp_keepalive_intvl = 10
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net.ipv4.tcp_keepalive_probes = 9
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# Don't relay bootp
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net.ipv4.conf.all.bootp_relay = 0
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# Don't proxy arp for anyone
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net.ipv4.conf.all.proxy_arp = 0
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# Turn on the tcp_timestamps, accurate timestamp make TCP congestion control algorithms work better
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net.ipv4.tcp_timestamps = 1
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# Don't ignore directed pings
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net.ipv4.icmp_echo_ignore_all = 0
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# Enable ignoring broadcasts request
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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# Enable bad error message Protection
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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# Allowed local port range
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net.ipv4.ip_local_port_range = 1024 65535
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# Enable a fix for RFC1337 - time-wait assassination hazards in TCP
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net.ipv4.tcp_rfc1337 = 1
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net.ipv4.tcp_sack=1
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net.ipv4.tcp_mtu_probing = 1
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net.ipv4.tcp_base_mss = 1024
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# Workaround for the RFC 5961 Linux TCP flaw?
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net.ipv4.tcp_challenge_ack_limit = 999999999
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# Restrict IPv6 Maximum Addresses
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net.ipv6.conf.all.max_addresses = 1
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net.ipv6.conf.default.max_addresses = 1
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##################################
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### TUNING NETWORK PERFORMANCE ###
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##################################
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# For high-bandwidth low-latency networks, use 'bbr' congestion control (kernel > 4.9)
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# Only enabled in bionic (at least v4.15)
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# Do a 'sudo modprobe tcp_bbr' first
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net.ipv4.tcp_congestion_control = bbr
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net.ipv4.tcp_notsent_lowat = 16384
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# Enable 'fq' queue management scheduler (kernel > 3.12)
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net.core.default_qdisc = fq
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# Turn on the tcp_window_scaling
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net.ipv4.tcp_window_scaling = 1
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# Disabled (we have seen performance decreased when enabled)
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net.core.busy_read = 0
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net.core.busy_poll = 0
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# Maximum number of packets taken from all interfaces in one polling cycle (NAPI poll).
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net.core.netdev_budget = 425
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# Seems like defaults are better for performance!
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# Increase the read-buffer space allocatable
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#net.ipv4.tcp_rmem = 4096 131072 6291456
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#net.ipv4.udp_rmem_min = 4096
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#net.core.rmem_default = 212992
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#net.core.rmem_max = 212992
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# Increase the write-buffer-space allocatable
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#net.ipv4.tcp_wmem = 4096 16384 4194304
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#net.ipv4.udp_wmem_min = 4096
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#net.core.wmem_default = 212992
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#net.core.wmem_max = 212992
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# Increase number of incoming connections
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net.core.somaxconn = 65535
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# Increase number of incoming connections backlog
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net.core.netdev_max_backlog = 16384
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net.core.dev_weight = 64
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# Increase the maximum amount of option memory buffers
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net.core.optmem_max = 65535
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# When mem allocated by TCP exceeds “pressure”, kernel will put pressure on TCP memory
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net.ipv4.tcp_mem=8388608 8388608 8388608
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# Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks
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net.ipv4.tcp_max_tw_buckets = 450000
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# try to reuse time-wait connections, (recycle is deprecated)
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#net.ipv4.tcp_tw_recycle = 0
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net.ipv4.tcp_tw_reuse = 1
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# Limit number of orphans, each orphan can eat up to 16M (max wmem) of unswappable memory
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net.ipv4.tcp_max_orphans = 262144
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net.ipv4.tcp_orphan_retries = 0
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# Limit the maximum memory used to reassemble IP fragments (CVE-2018-5391)
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net.ipv4.ipfrag_low_thresh = 196608
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net.ipv6.ip6frag_low_thresh = 196608
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net.ipv4.ipfrag_high_thresh = 262144
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net.ipv6.ip6frag_high_thresh = 262144
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# don't cache ssthresh from previous connection
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net.ipv4.tcp_no_metrics_save = 1
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net.ipv4.tcp_moderate_rcvbuf = 1
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# Increase size of RPC datagram queue length
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net.unix.max_dgram_qlen = 512
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# Prevent ARP issues
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net.ipv4.neigh.default.gc_thresh1 = 30000
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net.ipv4.neigh.default.gc_thresh2 = 32000
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net.ipv4.neigh.default.gc_thresh3 = 32768
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net.ipv6.neigh.default.gc_thresh1 = 30000
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net.ipv6.neigh.default.gc_thresh2 = 32000
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net.ipv6.neigh.default.gc_thresh3 = 32768
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# Adjust to arp table gc to clean-up more often
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net.ipv4.neigh.default.gc_interval = 30
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# Increase TCP queue length
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net.ipv4.neigh.default.proxy_qlen = 96
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net.ipv4.neigh.default.unres_qlen = 6
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# Enable Explicit Congestion Notification (RFC 3168), disable it if it doesn't work for you
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net.ipv4.tcp_ecn = 1
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net.ipv4.tcp_reordering = 3
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# How many times to retry killing an alive TCP connection
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net.ipv4.tcp_retries2 = 15
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net.ipv4.tcp_retries1 = 3
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# Avoid falling back to slow start after a connection goes idle
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# keeps our cwnd large with the keep alive connections (kernel > 3.6)
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net.ipv4.tcp_slow_start_after_idle = 0
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# Allow the TCP fastopen flag to be used, beware some firewalls do not like TFO! (kernel > 3.7)
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net.ipv4.tcp_fastopen = 3
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# This will enusre that immediatly subsequent connections use the new values
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net.ipv4.route.flush = 1
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net.ipv6.route.flush = 1
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