About centos7 /boot/partition processing

The following tutorial column of centos will introduce to you about centos7 /boot/ partition processing. I hope it will be helpful to friends in need!

/boot system boot partition

(1) Delete useless kernel

Check the disk capacity , 83% of the /boot partition is occupied, which is very dangerous. It is estimated that if you put another kernel, the system will not be able to open

boot]$ df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/sda1                194M  158M   27M  86% /boot

View the local kernel kernel model

boot]$ uname -r
3.10.0-957.1.3.el7.x86_64    #系统当前使用的内核版本号
 boot]$ rpm -q kernel
kernel-3.10.0-957.el7.x86_64    #内核旧版本，未删除的文件
kernel-3.10.0-957.1.3.el7.x86_64

View all Rpm packages related to the kernel kernel

boot]$ rpm -qa|grep kernel
kernel-tools-libs-3.10.0-957.1.3.el7.x86_64
kernel-3.10.0-957.1.3.el7.x86_64
kernel-debug-devel-3.10.0-1062.1.1.el7.x86_64
kernel-headers-3.10.0-957.1.3.el7.x86_64
kernel-3.10.0-957.el7.x86_64
kernel-tools-3.10.0-957.1.3.el7.x86_64

Delete useless kernel

boot]$ sudo rpm -e kernel-3.10.0-957.el7.x86_64

Check again

boot]$ rpm -q kernel
kernel-3.10.0-957.1.3.el7.x86_64

Complete deletion!

/boot 内存占用变为62%（但少得不是很多）
boot]$ df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/sda1                194M  114M   71M  62% /boot

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