WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service' error...execution phase preflight: [preflight] Some fatal errors occurred: [ERROR FileContent--proc-sys-net-ipv4...-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1 [preflight] If you know what you...另外关于 ipv4 通过 echo 1 > /proc/sys/net/ipv4/ip_forward 就可以了，这里的意思是是否打开 ip 转发。...[root@VM-23-61-centos ~]# echo "1" > /proc/sys/net/ipv4/ip_forward [root@VM-23-61-centos ~]# service
表示添加配置生效 iptables -vnL #出现 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) 表示添加配置生效 4.5 修改内核参数，将桥接的IPV4...] Some fatal errors occurred: [ERROR FileContent--proc-sys-net-bridge-bridge-nf-call-iptables]: /proc.../sys/net/bridge/bridge-nf-call-iptables contents are not set to 1 [preflight] If you know what you are...] Some fatal errors occurred: 主要看这里： [ERROR FileContent--proc-sys-net-ipv4-ip_forward]: /proc/sys/net.../ipv4/ip_forward contents are not set to 1 [preflight] If you know what you are doing, you can make a
" > /proc/sys/net/ipv4/tcp_wmem Echo "0" > /proc/sys/net/ipv4/tcp_sack Echo "0" > /proc/sys/net/ipv4...Echo "1" > /proc/sys/net/ipv4/tcp_no_metrics_save 在终止TCP连接之前需要重试多少次 Echo "5" > /proc/sys/net/ipv4/tcp_retries2...，而且很容易被滥用 Echo "0" > /proc/sys/net/ipv4/conf/all/accept_source_route Echo "0" > /proc/sys/net/ipv4/conf...Echo "1" > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses #启用rfc推荐的源验证(不应该在非常复杂网络的路由器上使用) Echo..."1" > /proc/sys/net/ipv4/conf/all/rp_filter Echo "1" > /proc/sys/net/ipv4/conf/default/rp_filter 增加IPv4
/sys/net/ipv4/tcp_max_syn_backlog: No such file or directory sysctl: cannot stat /proc/sys/net/ipv4/tcp_rmem...stat /proc/sys/net/ipv4/tcp_syncookies: No such file or directory sysctl: cannot stat /proc/sys/net/...cat /proc/sys/net/ipv4/tcp_max_syn_backlog cat /proc/sys/net/ipv4/tcp_rmem cat /proc/sys/net/ipv4.../tcp_sack cat /proc/sys/net/ipv4/ip_local_reserved_ports cat /proc/sys/net/ipv4/tcp_syncookies...cat /proc/sys/net/ipv4/tcp_window_scaling cat /proc/sys/net/ipv4/tcp_wmem 解决： 修改文件/opt/gcinstall
1 make: ***[libs] Error 2 解决：yum installlibnl* 编译安装Keepalived ..../sys/net/ipv4/conf/eth0/arp_ignore Echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore Echo 2 > /proc/sys.../net/ipv4/conf/eth0/arp_arp_announce Echo 2 > /proc/sys/net/ipv4/conf/all/arp_arp_announce 限定linux主机对.../sys/net/ipv4/conf/eth0/arp_ignore Echo 1 >/proc/sys/net/ipv4/conf/all/arp_ignore Echo 2 > /proc/sys/...net/ipv4/conf/eth0/arp_arp_announce Echo 2 > /proc/sys/net/ipv4/conf/all/arp_arp_announce 限定linux主机对arp
/sys/net/ipv4/conf/lo/arp_ignore echo “2” >/proc/sys/net/ipv4/conf/lo/arp_announce echo...“1” >/proc/sys/net/ipv4/conf/all/arp_ignore echo “2” >/proc/sys/net/ipv4/conf/all/arp_announce.../sys/net/ipv4/conf/lo/arp_ignore echo “0” >/proc/sys/net/ipv4/conf/lo/arp_announce echo...“0” >/proc/sys/net/ipv4/conf/all/arp_ignore echo “0” >/proc/sys/net/ipv4/conf/all/arp_announce...echo “0” >/proc/sys/net/ipv4/conf/all/arp_ignore echo “0” >/proc/sys/net/ipv4/conf/all/arp_announce
/sys/net/ipv4/conf/lo/arp_ignore echo "2">/proc/sys/net/ipv4/conf/lo/arp_announce echo "1">/proc/sys/...net/ipv4/conf/all/arp_ignore echo "2">/proc/sys/net/ipv4/conf/all/arp_announce } stop(){ for ((i=0;i<...${#VIP[*]};i++)) do /sbin/ifconfig lo:i {VIP[ done echo "0">/proc/sys/net/ipv4/conf/lo/arp_ignore...echo "0">/proc/sys/net/ipv4/conf/lo/arp_announce echo "0">/proc/sys/net/ipv4/conf/all/arp_ignore echo..."0">/proc/sys/net/ipv4/conf/all/arp_announce } case "$1" in start) start if [ $?
Please follow the guide at https://kubernetes.io/docs/setup/cri/ error execution phase preflight: [preflight...systemd/system/docker.service.d # Restart Docker systemctl daemon-reload systemctl restart docker [ERROR...FileContent–proc-sys-net-ipv4-ip_forward]: /proc/sys/net/ipv4/ip_forward contents are not set to 1 echo...“1” > /proc/sys/net/ipv4/ip_forward [ERROR DirAvailable–var-lib-etcd]: /var/lib/etcd is not empty rm...’） 解决：降低iptables版本，当前iptables-1.4.21-28.el7.x86_64，回滚为iptables-1.4.21-24.el7.x86_64 （centos7.5） Error
六、/proc/sys/net/ipv4/优化 1) /proc/sys/net/ipv4/ip_forward 该文件表示是否打开IP转发。...缺省设置：256（bytes） 6.1 IP Fragmentation 1) /proc/sys/net/ipv4/ipfrag_low_thresh/proc/sys/net/ipv4/ipfrag_low_thresh...缺省设置：0 4) /proc/sys/net/ipv4/icmp_echo_ignore_all/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts 该文件表示内核是否忽略所有的...0， 响应请求 1， 忽略请求 缺省设置：０ 建议设置：1 5) /proc/sys/net/ipv4/icmp_ratelimit 6) /proc/sys/net/ipv4/icmp_ratemask...7) /proc/sys/net/ipv4/icmp_ignore_bogus_error_reponses 某些路由器违背RFC1122标准，其对广播帧发送伪造的响应来应答。
/sys/net/core/somaxconn echo 50000 > /proc/sys/net/core/somaxconn 打开系统快速连接回收 cat /proc/sys/net/ipv4/tcp_tw_recycle...echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle 打开空的tcp连接允许回收利用 cat /proc/sys/net/ipv4/tcp_tw_reuse echo...1 > /proc/sys/net/ipv4/tcp_tw_reuse 不做洪水抵御 cat /proc/sys/net/ipv4/tcp_syncookies echo 0 > /proc/sys/net.../sys/net/core/somaxconn echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse...echo 0 > /proc/sys/net/ipv4/tcp_syncookies 排除问题： 系统的dmesg观察 nginx的error.log来观察 dmesg|tail 性能统计工具 安装统计模块
linux网络参数主要位于下面两个目录下:/proc/sys/net/core/和/proc/sys/net/ipv4/, 下面分别对这两个目录下常用的几个网络参数做下说明: 1..../proc/sys/net/ipv4/ $/proc/sys/net/ipv4/tcp_tw_recycle 加快回收TIME-WAIT套接字.0:关闭;1:开启 $/proc/sys/net/ipv4...$ /proc/sys/net/ipv4/tcp_wmem TCP写buffer,可参考的优化值: 4096 16384 131072 $ /proc/sys/net/ipv4/tcp_rmem...$ /proc/sys/net/ipv4/tcp_keepalive_time $ /proc/sys/net/ipv4/tcp_keepalive_intvl $ /proc/sys/net/ipv4...可调整到: /proc/sys/net/ipv4/tcp_keepalive_time 1800 /proc/sys/net/ipv4/tcp_keepalive_intvl 30 /proc/sys
另外，这里的重试次数可以配置，由客户端机器的如下内核参数指定： $ cat /proc/sys/net/ipv4/tcp_syn_retries 6 # 不同的发行版本，参数可能不同 $ uname...这个重试次数也由内核参数控制： $ cat /proc/sys/net/ipv4/tcp_synack_retries 5 将客户端内核参数 tcp_synack_retries 设置成 1 之后，TCP...TCP 建立连接后的数据包传输，最大超时重传次数是由 tcp_retries2 指定，默认值是 15 次，这里为了便于观测，将数值调整成了 10 次，如下: $ cat /proc/sys/net/ipv4.../proc/sys/net/ipv4/tcp_keepalive_intvl $ cat /proc/sys/net/ipv4/tcp_keepalive_probes $ cat /proc/sys/.../sys/net/ipv4/tcp_keepalive_intvl $ echo 40 > /proc/sys/net/ipv4/tcp_keepalive_time $ echo 2 > /proc/
Net ---- 1 net.ipv4.tcp_syncookies=1 查询命令： 1 cat /proc/sys/net/ipv4/tcp_syncookies 默认值：1 作用：是否打开SYN.../proc/sys/net/ipv4/tcp_fin_timeout 默认值：60(s) 作用：TCP挥手阶段FIN报文超时时间 ---- 1 net.ipv4.tcp_timestamps=1...查询命令： 1 cat /proc/sys/net/ipv4/tcp_timestamps 默认值：1 作用：TCP时间戳 ---- 1 net.ipv4.tcp_tw_recycle=0 # Ubuntu...系统下未找到该变量 查询命令： 1 cat /proc/sys/net/ipv4/tcp_tw_recycle 默认值：0 作用：针对TIME-WAIT，不要开启。...---- 1 net.ipv4.tcp_max_orphans=3276800 查询命令： 1 cat /proc/sys/net/ipv4/tcp_max_orphans 默认值：32768 作用
@hadoop1 ~]# echo 50000 > /proc/sys/net/core/somaxconn [root@hadoop1 ~]# more /proc/sys/net/core/somaxconn...hadoop1 ipv4]# cd /proc/sys/net/ipv4/ [root@hadoop1 ipv4]# echo 1 > tcp_tw_recycle [root@hadoop1...ipv4]# more /proc/sys/net/ipv4/tcp_tw_recycle 1 1-9）、空的tcp是否允许回收利用（Reuse） [root@skycloud1 ipv4]# cd.../proc/sys/net/ipv4 [root@skycloud1 ipv4]# more /proc/sys/net/ipv4/tcp_tw_reuse 0 [root@skycloud1...ipv4]# echo 1 > tcp_tw_reuse [root@skycloud1 ipv4]# more /proc/sys/net/ipv4/tcp_tw_reuse 1
/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/...sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce 服务器添加首页 echo abctest192.168.0.134.../sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys.../sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys.../net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
或：cat /proc/net/dev ? 三、error 查看： ethtool -S eth0 | grep errors ? 根据相应的错误进行处理。...查看当前 netdev_max_backlog：cat /proc/sys/net/core/netdev_max_backlog 设置netdev_max_backlog：sysctl -w net.core.netdev_max_backlog...=4096 或者 echo "4096" > /proc/sys/net/core/netdev_max_backlog 六、关于 rp_filter 反向路由过滤导致丢包： 反向路由过滤机制是Linux.../sys/net/ipv4/conf/eth0/rp_filter 设置：所有不验证：sysctl -w net.ipv4.conf.all.rp_filter=0 | 网卡eth0不验证：sysctl...查看：/proc/sys/net/ipv4/tcp_max_syn_backlog 设置：sysctl -w net.ipv4.tcp_max_syn_backlog=xxxxx 查看是否有丢弃情况：dmesg
[ENABLED] /proc/sys/net/ipv4/conf/em4/rp_filter [ENABLED] /proc/sys/net/ipv4...] /proc/sys/net/ipv4/conf/tap8314f726-c7/rp_filter [ENABLED] /proc/sys/net/ipv4/conf/tap8b0bfb5c-fc.../rp_filter [ENABLED] /proc/sys/net/ipv4/conf/tap9e0ad654-eb/rp_filter [ENABLED] /proc/sys/net/ipv4...] /proc/sys/net/ipv4/conf/tapda472e40-78/rp_filter [ENABLED] /proc/sys/net/ipv4/conf/tapdc7ebaa9-38.../rp_filter [ENABLED] /proc/sys/net/ipv4/conf/tun0/rp_filter [ENABLED] /proc/sys/net/ipv4
/sys/net/ipv4/ip_forward echo '1' > /proc/sys/net/ipv4/conf/tunl0/arp_ignore echo '2' > /proc/sys/net.../ipv4/conf/tunl0/arp_announce echo '1' > /proc/sys/net/ipv4/conf/all/arp_ignore echo '2' > /proc/sys/.../sys/net/ipv4/ip_forward echo '1' > /proc/sys/net/ipv4/conf/tunl0/arp_ignore echo '2' > /proc/sys/net.../ipv4/conf/tunl0/arp_announce echo '1' > /proc/sys/net/ipv4/conf/all/arp_ignore echo '2' > /proc/sys/...net/ipv4/conf/all/arp_announce echo '0' > /proc/sys/net/ipv4/conf/tunl0/rp_filter echo '0' > /proc/sys
(net.Error); ok && ne.Temporary() { if tempDelay == 0 { tempDelay = 5 * time.Millisecond...三次握手产生的：sync队列和accept队列 accept是取得accept队列中的Establish状态的连接 accept-queue满了怎么办 accept队列长度： min(/proc/sys...默认情况下，即/proc/sys/net/ipv4/tcp_abort_on_overflow为0时，服务端会忽略客户端响应的ack(连接会停留在syn队列)，等待超时，服务端重新发送sync+ack给客户端...(net.ipv4.tcp_synack_retries)； /proc/sys/net/ipv4/tcp_abort_on_overflow为1时，accept-queue满，服务端会响应rst。...syn队列满了怎么办 /proc/sys/net/ipv4/tcp_max_syn_backlog 若SYN队列满，则会直接丢弃请求，即新的SYN网络分组会被丢弃；客户端则会超时重传syn.
/sys/net/core/wmem_max 110592 定义发送窗口的最大大小；对于更大的 BDP 来说，这个大小也应该更大 /proc/sys/net/ipv4/tcp_window_scaling.../sys/net/ipv4/tcp_fack 1 启用转发应答（Forward Acknowledgment），这可以进行有选择应答（SACK）从而减少拥塞情况的发生；这个选项也应该启用 /proc/sys.../net/ipv4/tcp_timestamps 1 以一种比重发超时更精确的方法（请参阅 RFC 1323）来启用对 RTT 的计算；为了实现更好的性能应该启用这个选项 /proc/sys/net/ipv4...echo 256960 > /proc/sys/net/core/wmem_max。 echo 0 > /proc/sys/net/ipv4/tcp_timestamps。...echo 1 > /proc/sys/net/ipv4/tcp_sack。 echo 1 > /proc/sys/net/ipv4/tcp_window_scaling。
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