linux 系统 tcp 内核参数

Posted 2020-12-15 zzzzy09

来自：https://www.kernel.org/doc/html/latest/admin-guide/sysctl/user.html

sysctl 命令：
sysctl命令被用于在内核运行时动态地修改内核的运行参数，
可用的内核参数在目录/proc/sys中。它包含一些TCP/ip堆栈和
虚拟内存系统的高级选项， 这可以让有经验的管理员提高引人注目的系统性能。用sysctl可以读取设置超过五百个系统变量。

sysctl -a :查看所有可读变量
编辑此文件：/etc/sysctl.conf :内核参数设定文件，永久有效

sysctl ：
-p：从配置文件“/etc/sysctl.conf”加载内核参数设置
sysctl -a :查看所有可读变量

Table : Subdirectories in /proc/sys/net

Directory	Content		Directory	Content
core 内核	General parameter		appletalk	Appletalk protocol
unix   unix 套接字	Unix domain sockets		netrom	NET/ROM
802   802 协议，物理层数据链路层	E802 protocol		ax25	AX25
ethernet  以太网	Ethernet protocol		rose	X.25 PLP layer
ipv4	IP version 4		x25	X.25 protocol
bridge	Bridging		decnet	DEC net
ipv6	IP version 6		tipc	TIPC

 

 

配置文件

[root@kube ipv4]# pwd
/proc/sys/net/ipv4 
[root@kube ipv4]# ls
cipso_cache_bucket_size            igmp_qrv                 ip_nonlocal_bind                  tcp_ecn                 tcp_mem                    tcp_synack_retries
cipso_cache_enable                 inet_peer_maxttl         ip_no_pmtu_disc                   tcp_fack                tcp_min_tso_segs           tcp_syncookies
cipso_rbm_optfmt                   inet_peer_minttl         neigh                             tcp_fastopen            tcp_moderate_rcvbuf        tcp_syn_retries
cipso_rbm_strictvalid              inet_peer_threshold      ping_group_range                  tcp_fastopen_key        tcp_mtu_probing            tcp_thin_dupack
conf                               ip_default_ttl           route                             tcp_fin_timeout         tcp_no_metrics_save        tcp_thin_linear_timeouts
fwmark_reflect                     ip_dynaddr               tcp_abort_on_overflow             tcp_frto                tcp_notsent_lowat          tcp_timestamps
icmp_echo_ignore_all               ip_early_demux           tcp_adv_win_scale                 tcp_invalid_ratelimit   tcp_orphan_retries         tcp_tso_win_divisor
icmp_echo_ignore_broadcasts        ip_forward               tcp_allowed_congestion_control    tcp_keepalive_intvl     tcp_reordering             tcp_tw_recycle
icmp_errors_use_inbound_ifaddr     ip_forward_use_pmtu      tcp_app_win                       tcp_keepalive_probes    tcp_retrans_collapse       tcp_tw_reuse
icmp_ignore_bogus_error_responses  ipfrag_high_thresh       tcp_autocorking                   tcp_keepalive_time      tcp_retries1               tcp_window_scaling
icmp_msgs_burst                    ipfrag_low_thresh        tcp_available_congestion_control  tcp_limit_output_bytes  tcp_retries2               tcp_wmem
icmp_msgs_per_sec                  ipfrag_max_dist          tcp_base_mss                      tcp_low_latency         tcp_rfc1337                tcp_workaround_signed_windows
icmp_ratelimit                     ipfrag_secret_interval   tcp_challenge_ack_limit           tcp_max_orphans         tcp_rmem                   udp_mem
icmp_ratemask                      ipfrag_time              tcp_congestion_control            tcp_max_ssthresh        tcp_sack                   udp_rmem_min
igmp_max_memberships               ip_local_port_range      tcp_dsack                         tcp_max_syn_backlog     tcp_slow_start_after_idle  udp_wmem_min
igmp_max_msf                       ip_local_reserved_ports  tcp_early_retrans                 tcp_max_tw_buckets      tcp_stdurg                 xfrm4_gc_thresh
[root@kube ipv4]#