290 lines
8.1 KiB
Plaintext
290 lines
8.1 KiB
Plaintext
# sysctl settings are defined through files in
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# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
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#
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# Vendors settings live in /usr/lib/sysctl.d/.
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# To override a whole file, create a new file with the same in
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# /etc/sysctl.d/ and put new settings there. To override
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# only specific settings, add a file with a lexically later
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# name in /etc/sysctl.d/ and put new settings there.
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#
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# For more information, see sysctl.conf(5) and sysctl.d(5).
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### GENERAL SYSTEM SECURITY OPTIONS ###
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# Kernel settings
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kernel.printk = 4 4 1 7
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kernel.panic = 10
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kernel.hung_task_panic = 1
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kernel.nmi_watchdog = 0
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kernel.core_pattern = /var/crash/core.%e.pid_%p.uid_%u.sig_%s
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kernel.dmesg_restrict = 1
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kernel.perf_event_paranoid = 3
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#kernel_modules_disabled = 1
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kernel.yama.ptrace_scope = 1 2 3
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# FS
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fs.protected_fifos = 2
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fs.protected_hardlinks = 1
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fs.protected_regular = 2
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fs.protected_symlinks = 1
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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 = 65535
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# Enable ExecShield protection
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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.msgmnb = 65536
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# Controls the default maxmimum size of a mesage queue
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kernel.msgmax = 65536
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# Restrict core dumps
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fs.suid_dumpable = 0
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# Hide exposed kernel pointers
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kernel.kptr_restrict = 2
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### KERNEL FINE TUNNING ###
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kernel.sem = 250 256000 64 512
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# Configure Kernel Parameter for Accepting ICMP Redirects By Default
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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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# Disable Kernel Parameter for Sending ICMP Redirects for All Interfaces
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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.ipv6.conf.all.accept_redirects = 0
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net.ipv6.conf.default.accept_redirects = 0
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# Ensure ICMP redirects are not accepted
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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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# Enable ip forwarding
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net.ipv4.ip_forward = 1
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# Enable IP spoofing protection
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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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# Ensure source routed packets are not accepted
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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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# Ignoring broadcasts request
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net.ipv4.icmp_echo_ignore_broadcasts=1
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#net.ipv4.icmp_ignore_bogus_error_messages=1
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# Make sure spoofed packets get logged
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net.ipv4.conf.all.log_martians = 1
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# nginx
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# recycle Zombie connections
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#net.inet.tcp.fast_finwait2_recycle = 1
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#net.inet.tcp.maxtcptw = 200000
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# increase number of files
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#kern.maxfiles = 65535
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#kern.maxfilesperproc = 16384
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net.ipv4.tcp_fin_timeout = 30
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net.ipv4.ip_local_port_range = 1024 65023
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# Increase size of file handles and inode cache
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fs.file-max = 2097152
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# do less swapping
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vm.swappiness = 10
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vm.dirty_background_ratio = 1
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vm.dirty_ratio = 1
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vm.dirty_background_bytes = 5
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#vm.dirty_bytes = 0
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vm.dirty_writeback_centisecs = 500
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vm.dirty_expire_centisecs = 3000
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vm.vfs_cache_pressure = 50
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# specifies the minimum virtual address that a process is allowed to mmap
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vm.mmap_min_addr = 4096
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# Set maximum amount of memory allocated to shm to 256MB
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kernel.shmmax = 268435456
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kernel.shmall = 268435456
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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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# 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_syn_retries = 2
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net.ipv4.tcp_synack_retries = 2
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# increase socket listen backlog
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net.core.somaxconn = 32768
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net.ipv4.tcp_max_tw_buckets = 1440000
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# number of packets to keep in backlog before the kernel starts dropping them
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net.ipv4.tcp_max_syn_backlog = 65535
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# Decrease the time default value for tcp_fin_timeout connection
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net.ipv4.tcp_fin_timeout = 15
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# Decrease the time default value for connections to keep alive
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net.ipv4.tcp_keepalive_time = 300
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net.ipv4.tcp_keepalive_probes = 10
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net.ipv4.tcp_keepalive_intvl = 30
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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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# 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.inet.tcp.delayed_ack = 0
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#net.inet.tcp.restrict_rst = 1
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### TUNING NETWORK PERFORMANCE ###
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# For high-bandwidth low-latency networks, use 'htcp' congestion control
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# Do a 'modprobe tcp_htcp' first
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#net.ipv4.tcp_congestion_control = htcp
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# Turn on the tcp_window_scaling
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net.ipv4.tcp_window_scaling = 1
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# Increase the read-buffer space allocatable
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net.ipv4.tcp_rmem = 8192 87380 16777216
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net.ipv4.udp_rmem_min = 16384
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net.core.rmem_default = 8388608
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net.core.rmem_max = 16777216
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# Increase the write-buffer-space allocatable
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net.ipv4.tcp_wmem = 8192 65536 16777216
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net.ipv4.udp_wmem_min = 16384
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net.core.wmem_default = 8388608
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net.core.wmem_max = 16777216
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# Increase number of incoming connections
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net.ipv4.tcp_max_tw_buckets = 1440000
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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 = 25165824
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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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# Increase the maximum memory used to reassemble IP fragments
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net.ipv4.ipfrag_high_thresh = 512000
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net.ipv4.ipfrag_low_thresh = 446464
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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 = 50
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# Don't allow the arp table to become bigger than this
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net.ipv4.neigh.default.gc_thresh3 = 2048
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# Tell the gc when to become aggressive with arp table cleaning.
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# Adjust this based on size of the LAN. 1024 is suitable for most /24 networks
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net.ipv4.neigh.default.gc_thresh2 = 1024
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# Adjust where the gc will leave arp table alone - set to 32.
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net.ipv4.neigh.default.gc_thresh1 = 32
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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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net.ipv4.ip_nonlocal_bind = 1
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net.ipv4.tcp_abort_on_overflow = 0
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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 = 2
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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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# 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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# mitigate against buffer overflows
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#kernel.exec-shield = 1
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kernel.randomize_va_space = 2
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# maximum number of allowable concurrent requests (default 64K)
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#fs.aio-max-nr = 1048576
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vm.max_map_count = 262144
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vm.overcommit_memory = 1
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# congestion control (kernel 4.x)
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#net.ipv4.tcp_ecn = 2
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#net.core.default_qdisc=fq
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#net.ipv4.tcp_congestion_control=bbr
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# Added by hwdsl2 VPN script
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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kernel.shmmax = 68719476736
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kernel.shmall = 4294967296
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.all.rp_filter = 1
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.eth0.send_redirects = 0
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net.ipv4.conf.eth0.rp_filter = 0
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net.core.wmem_max = 12582912
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net.core.rmem_max = 12582912
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net.ipv4.tcp_rmem = 10240 87380 12582912
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net.ipv4.tcp_wmem = 10240 87380 12582912
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fs.inotify.max_user_watches=524288
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