In the evening of 2020-12-10, in order to achieve a smooth upgrade from php7.1 to php7.3, according to https://blog.csdn.net/baidu_35297131/article/details/89960654 this article modified yum related configuration files, and the result is php The upgrade is unsuccessful, and yum cannot be used either, only uninstall and reinstall
Uninstall:
# rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps
# whereis yum |xargs rm -frvReinstall:
During reinstallation, an error has been reported due to dependency issues:
error: Failed dependencies:
/usr/bin/python is needed by yum-3.4.3-163.el7.centos.noarch
python >= 2.4 is needed by yum-3.4.3-163.el7.centos.noarch
python(abi) = 2.7 is needed by yum-3.4.3-163.el7.centos.noarch
python-iniparse is needed by yum-3.4.3-163.el7.centos.noarch
python-sqlite is needed by yum-3.4.3-163.el7.centos.noarch
python-urlgrabber >= 3.10-8 is needed by yum-3.4.3-163.el7.centos.noarch
rpm-python is needed by yum-3.4.3-163.el7.centos.noarch
libpython2.7.so.1.0()(64bit) is needed by yum-metadata-parser-1.1.4-10.el7.x86_64
python(abi) = 2.7 is needed by yum-metadata-parser-1.1.4-10.el7.x86_64
1. View the yum installation package
# rpm -qa | grep yum
yum-plugin-fastestmirror-1.1.31-52.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64
yum-utils-1.1.31-52.el7.noarch
2. Uninstall them all
#rpm -e yum-plugin-fastestmirror-1.1.31-52.el7.noarch --nodeps
#rpm -e yum-metadata-parser-1.1.4-10.el7.x86_64 --nodeps
#rpm -e yum-utils-1.1.31-52.el7.noarch --nodeps
3. Download the following 20 packages at http://mirrors.163.com/centos/7/os/x86_64/Packages/ (the following resources can be downloaded in "csdn-my resources" )
libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
python-ipaddress-1.0.16-2.el7.noarch.rpm
lvm2-python-libs-2.02.185-2.el7.x86_64.rpm
python-kitchen-1.1.1-5.el7.noarch.rpm
yum-3.4.3-163.el7.centos.noarch.rpm
python-2.7.5-86.el7.x86_64.rpm
python-libs-2.7.5-86.el7.x86_64.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
python-pycurl-7.19.0-19.el7.x86_64.rpm
yum-plugin-aliases-1.1.31-52.el7.noarch.rpm
python-chardet-2.2.1-3.el7.noarch.rpm
python-setuptools-0.9.8-7.el7.noarch.rpm
yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
python-devel-2.7.5-86.el7.x86_64.rpm
python-urlgrabber-3.10-9.el7.noarch.rpm
yum-plugin-protectbase-1.1.31-52.el7.noarch.rpm
python-iniparse-0.4-9.el7.noarch.rpm
rpm-python-4.11.3-40.el7.x86_64.rpm
yum-utils-1.1.31-52.el7.noarch.rpm
4. Execute after downloading
#rpm -Uvh --replacepkgs lvm2-python-libs*.rpm --nodeps --force
#rpm -Uvh --replacepkgs libxml2-python*.rpm --nodeps --force
#rpm -Uvh --replacepkgs python*.rpm --nodeps --force
#rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm --nodeps --force
5. Successful installation
6. If you change python to python3, you will get an error when running yum
[root@iz2ze3ogy01eqvjs99e8nez python]# yum
File "/usr/bin/yum", line 30
except KeyboardInterrupt, e:
^
SyntaxError: invalid syntax
修改 vi /etc/usr/yum 第一行为
#!/usr/bin/python2
Set yum mirror source
1. Enter the yum mirror source configuration folder
[root@localhost /]# cd /etc/yum.repos.d/2. Back up the original image file of the system
[root@localhost yum.repos.d]# mv CentOs-Base.repo CentOs-Base.repo.bak3. Download the mirror source
163 yum mirror source: http://mirrors.163.com/.help/CentOS7-Base-163.repo
Alibaba cloud yum mirror source: http://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost yum.repos.d]# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repoor
[root@localhost yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo
[root@localhost yum.repos.d]# mv Centos-7.repo CentOs-Base.repo #重命名镜像文件4. Clear the cache
[root@localhost yum.repos.d]# yum clean all5. Generate cache
[root@localhost yum.repos.d]# yum makecache6. Upgrade and update
[root@localhost yum.repos.d]# yum -y update #升级所有包同时也升级软件和系统内核or
[root@localhost yum.repos.d]# yum -y upgrade #只升级所有包，不升级软件和系统内核