invalid syntax of /etc/sysctl.conf after executing init os script

[hzhhong]

What is version of KubeKey has the issue?

version.BuildInfo{Version:"2.2.1", GitCommit:"c056977c", GitTreeState:"", GoVersion:"go1.17.11"}

What is your os environment?

CentOS Linux release 7.5.1804 (Core)

KubeKey config file

No response

A clear and concise description of what happend.

invalid syntax of /etc/sysctl.conf after executing init os script

Relevant log output

22:03:01 CST [GreetingsModule] Greetings
...
22:03:30 CST [ConfigureOSModule] Exec init os script
22:03:44 CST stdout: [mid-ksnode3]
setenforce: SELinux is disabled
Disabled
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
...
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
kernel.sysrq = 1
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-arptables = 1
sysctl: /etc/sysctl.conf(103): invalid syntax, continuing...

Additional information

No response

[hzhhong]

Reproduces the problem when the file size is larger than 4Kbytes. Writing to a file while you're reading it is a recipe for disaster.
awk ' !x[$0]++{print > "/etc/sysctl.conf"}' /etc/sysctl.conf