☰

Centos7上如何配置keepalive

tag-icon • tag-icon centos configuration tcp
Centos7上如何配置keepalive

在 CentOS 7 上如何以及在哪里配置 TCP keepalive？

我试图找到它：

[michael@devserver ~]$ cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /run/sysctl.d/* | grep keep
cat: /run/sysctl.d/*: No such file or directory
[michael@devserver ~]$ cat /etc/sysctl.d/* | grep keep
[michael@devserver ~]$ cat /usr/lib/sysctl.d/* | grep keep
[michael@devserver ~]$ ls /proc/sys/net/ipv4/ | grep tcp_keep
tcp_keepalive_intvl
tcp_keepalive_probes
tcp_keepalive_time
[michael@devserver ~]$ cat /proc/sys/net/ipv4/tcp_keep*
75
9
7200
[michael@devserver ~]$ whereis tcp_keepalive
tcp_keepalive:[michael@devserver ~]$ whereis tcp_keepalived
tcp_keepalived:[michael@devserver ~]$ whereis keepalive
keepalive:[michael@devserver ~]$ whereis keepalived
keepalived:[michael@devserver ~]$ ls /etc | grep keep
[michael@greenbeantech ~]$

答案1

这TCP 保活指南指配置TCP keepalive的两种方法：

  • procfs 接口

  • 系统控制接口

正如您已经发现的，您可以通过将新数字写入相应的 /proc 文件来更新这些值，例如：

echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time

或通过 sysctl:

sysctl -w net.ipv4.tcp_keepalive_time=600

... 虽然两者都不其中的更改在重新启动后仍然有效。

为了使更改在重新启动后持续存在，您需要将这些值放置在（或通过）中/etc/sysctl.conf。我面前没有 CentOS 系统，但 /etc/sysctl.conf 可能是从/etc/sysctl.d/.

我的建议是在 /etc/sysctl.d/ 中创建一个文件，其内容格式如下：

net.ipv4.tcp_keepalive_time=7200
net.ipv4.tcp_keepalive_intvl=75
net.ipv4.tcp_keepalive_probes=9

sysctl 文件按数字顺序读取，因此如果您希望您的值优先，请注意您已经看到的警告：

要仅覆盖特定设置，请在 /etc/sysctl.d/ 中添加一个按词法命名的文件，并在其中放置新设置。

相关内容