从CentOS7 升级到RockyLinux8

下面是完整的升级记录

	192  cat /etc/os-release
  193  yum -y install epel-release
  194  yum -y upgrade
  195  reboot
  196  yum -y install rpmconf yum-utils
  197  rpmconf -a
  198  yum -y install dnf
  199  dnf -y remove yum yum-metadata-parser
  200  rpm -e --nodeps `rpm -qa|grep centos-`
  201  rpm -ivh --nodeps --force https://mirrors.aliyun.com/rockylinux/8/BaseOS/x86_64/os/Packages/r/rocky-release-8.9-1.6.el8.noarch.rpm
  202  rpm -ivh --nodeps  --force https://mirrors.aliyun.com/rockylinux/8/BaseOS/x86_64/os/Packages/r/rocky-repos-8.9-1.6.el8.noarch.rpm
  203  rpm -ivh --nodeps --force https://mirrors.aliyun.com/rockylinux/8/BaseOS/x86_64/os/Packages/r/rocky-gpg-keys-8.9-1.6.el8.noarch.rpm
  204  dnf -y upgrade https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
  205  dnf clean all
  206  rpm -e --nodeps `rpm -qa|grep -i kernel`
  207  vi /usr/lib/python2.7/site-packages/sitecustomize.py(option)
  208  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
  

### 错误解决

运行上面的命令后，会有错误的提示，比如kernel-core-4.18需要安装什么软件包之类的。我们可以直接在/var/cache/dnf目录下找到这个kernel的安装包进行安装。

  212  find /var/cache/dnf -name *kernel-core-4.18*
  213  rpm -ivh --nodeps --force /var/cache/dnf/baseos-3e608afeebc9a90b/packages/kernel-core-4.18.0-513.9.1.el8_9.x86_64.rpm
  214  find /var/cache/dnf -name *dracut-network-049-228.git20230802.el8.x86_64*
  215  rpm -ivh --nodeps --force /var/cache/dnf/baseos-3e608afeebc9a90b/packages/dracut-network-049-228.git20230802.el8.x86_64.rpm
  216  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync

### 卸载冲突的包

这个要根据实际情况检查，有的确实是包冲突，要删除，有的并不是，可能是原来的repo中加载了一些rockylinux不太支持的包，需要禁用这些repo。

  217  rpm -e --nodeps sysvinit-tools-2.88-14.dsf.el7.x86_64
  218  rpm -e --nodeps python36-six-1.14.0-2.el7.noarch
  219  rpm -e --nodeps ython3-six-1.11.0-8.el8.noarch
  221  rpm -e --nodeps python36-PyYAML-3.13-1.el7.x86_64
  222  rpm -e --nodeps python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch
  223  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
  
  228  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
 
  235  rpm -e --nodeps python36-six-1.14.0-3.el7.noarch
  236  dnf install platform-python-setuptools-39.2.0-7.el8.noarch
  237  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
  238  rpm -e --nodeps platform-python-setuptools-39.2.0-7.el8.noarch
  239  rpm -e --nodeps python-six-1.3.0-4.el7.noarch 

  245  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync

依然会有错误提示

检查当前更新源，将里面无关的都修改掉

 
  258  dnf repolist
  259  cd /etc/dnf/
  260  vi dnf.conf
  261  cd /etc/yum.repos.d
  262  ls
  263  mv epel-testing-modular.repo epel-testing-modular.repo.bak
  264  mv epel-testing.repo epel-testing.repo.bak
  265  mv salt-latest.repo salt-latest.repo.bak
  266  mv salt-py3-latest.repo salt-py3-latest.repo.bak
  267  mv zabbix-non-supported.repo zabbix-non-supported.repo.bak
  268  mv zabbix.repo zabbix.repo.bak
       mv docker-ce.repo docker-ce.repo.bak
  269  dnf upgrade
  270  rpm -e --nodeps python-linux-procfs-0.4.11-4.el7.noarch
  271  rpm -e --nodeps gdbm-1.10-8.el7.x86_64
  272  dnf upgrade
  273  dnf upgrade --best --allowerasing rpm
  274  dnf -y --releasever=8 --allowerasing --setopt=deltarpm=false distro-sync
 

安装内核和最小化系统

  278  dnf -y install kernel-core
  279  dnf -y groupupdate "Core" "Minimal Install"
  281  shutdown -r now
  282  cat /etc/os-release 
 

至此，更新完成。