为什么升级

jenkins 2.4版本需要CentOS8

一、参考文档

点我

二、升级步骤

1.安装epel源

yum -y install epel-release

2.安装rpmconf和yum-utils

yum -y install rpmconf yum-utils

3.执行rpmconf ，如果出现一些提示，请输入Y和回车继续，如果没提示继续第四步操作

rpmconf -a

选 Y

4.安装dnf

yum -y install dnf

5.移除yum和yum-metadata-parser

dnf -y remove yum yum-metadata-parser

6.删除/etc/yum目录

rm -rf /etc/yum

7.安装Centos8的源和升级epel源

dnf -y upgrade

## 原始--404 bug
dnf -y upgrade http://mirrors.163.com/centos/8.0.1905/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm

镜像地址找不到

查找镜像地址

## 改进
dnf -y upgrade http://mirrors.163.com/centos-vault/8.0.1905/BaseOS/x86_64/os/Packages/centos-release-8.0-0.1905.0.9.el8.x86_64.rpm

dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

dnf clean all

8.卸载centos7的内核

rpm -e --nodeps `rpm -q kernel`

9.执行rpmconf

rpmconf -a

10.查看linux 版本信息

cat /etc/redhat-release

三、安装git

编码错误

dnf --version

出现错误

UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 4: ordinal not in range(128)

解决办法

vim /etc/profile 

#在文件的末尾添加如下两句话

export LC_ALL="en_US.UTF-8"
export LANG="zh_CN.GBK"

重启生效

source /etc/profile

缓存问题

参考文档
https://www.cnblogs.com/mojt/p/17656139.html

//以下操作需要 root 权限
//进入 repo 目录
cd /etc/yum.repos.d
 
//建议备份原文件
cp CentOS-Base.repo CentOS-Base.repo.bak
//AppStream 和 Extras 方法同上

vim CentOS-AppStream.repo
 
//修改内容
[AppStream]
name=CentOS-$releasever - AppStream
baseurl=https://repo.huaweicloud.com/centos-vault/8.0.1905/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
 
vim CentOS-Base.repo
 
//修改为以下内容
[BaseOS]
name=CentOS-$releasever - Base
baseurl=https://repo.huaweicloud.com/centos-vault/8.0.1905/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
  
vim CentOS-Extras.repo
 
//修改内容
[extras]
name=CentOS-$releasever - Extras
baseurl=https://repo.huaweicloud.com/centos-vault/8.0.1905/BaseOS/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
 
//清除缓存
dnf clean all
 
//建立缓存
dnf makecache

安装git

dnf install -y git

依赖冲突问题

Error: Transaction check error:
  file /usr/lib64/libgdbm_compat.so.4.0.0 from install of gdbm-libs-1:1.18-1.el8.x86_64 conflicts with file from package gdbm-1.10-8.el7.x86_64

解决办法

1、强制卸载旧版本 gdbm：

rpm -e --nodeps gdbm-1.10-8.el7.x86_64

2、清理缓存

dnf clean all

3、安装新版本的 gdbm-libs

dnf install gdbm-libs-1:1.18-1.el8.x86_64

4、重新安装 git：

 dnf install -y git

查看git 版本

git --version