centos9 image source, network configuration, accidentally deleted python recovery

centos9

Accidentally deleted python recovery solution

centos9 accidentally deleted /usr/bin/python3.9, causing yum to become unavailable.

[root@localhost ~]# yum makecache
-bash: /usr/bin/yum: /usr/bin/python3.9: bad interpreter: No such file or directory
[root@localhost ~]# python3
-bash: /usr/bin/python3: No such file or directory
[root@localhost ~]# python3.9
-bash: /usr/bin/python3.9: No such file or directory

If you just delete this file without doing any other operations, then the recovery is also very simple. At this time, all python related packages are still installed. You only need to find the corresponding package, uninstall it and reinstall it.

[root@localhost ~]# rpm -qa | grep python
python3-setuptools-wheel-53.0.0-12.el9.noarch
python3-pip-wheel-21.2.3-7.el9.noarch
python-unversioned-command-3.9.18-1.el9.noarch
python3-3.9.18-1.el9.x86_64
python3-libs-3.9.18-1.el9.x86_64
python3-libcomps-0.1.18-1.el9.x86_64
python3-six-1.15.0-9.el9.noarch
python3-dateutil-2.8.1-7.el9.noarch
python3-systemd-234-18.el9.x86_64
libcap-ng-python3-0.8.2-7.el9.x86_64
python3-nftables-1.0.4-11.el9.x86_64
python3-dbus-1.2.18-2.el9.x86_64
python3-gobject-base-noarch-3.40.1-6.el9.noarch
python3-gobject-base-3.40.1-6.el9.x86_64
python3-firewall-1.2.5-1.el9.noarch
python3-libdnf-0.69.0-6.el9.x86_64
python3-hawkey-0.69.0-6.el9.x86_64
python3-gpg-1.15.1-6.el9.x86_64
python3-rpm-4.16.1.3-25.el9.x86_64
python3-dnf-4.14.0-8.el9.noarch
python3-dnf-plugins-core-4.3.0-11.el9.noarch
python3-libselinux-3.5-1.el9.x86_64

Obviously, we need to install python3-3.9.18-1.el9.x86_64. First download the rpm package. It is recommended to use wget to download the rpm package. Download it directly from the browser or download it through the crawler. The file cannot be recognized when installing the rpm!

wget https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/Packages/python3-3.9.18-1.el9.x86_64.rpm

# Before installation, you will be prompted that it has been installed and needs to be uninstalled first.
rpm -e --nodeps python3-3.9.18-1.el9.x86_64

rpm -i python3-3.9.18-1.el9.x86_64.rpm

Tested python3.9, yum command is normal.

If you don’t know which package the accidentally deleted file corresponds to, here is a crude solution.

1. rpm obtains all installed python packages on the system.

   rpm -qa | grep python > python-rpm.txt
   

2. Uninstall all python related packages.

   # Forcefully delete python installed programs and their associations
   rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps
   # Delete remaining python files
   whereis python |xargs rm -frv
   Verify deletion and return no result
   where is python
   

3. Download and install all python packages again. Use a script to call wget for batch downloading

   #!/bin/bash
   
   deps=$(sed 's/\r//g' ./python-rpm.txt)
   download_dir=./python-rpms
   for dep in $deps
   do
     rpm_name=${dep}.rpm
     wget -P $download_dir https://mirrors.aliyun.com/centos-stream/9-stream/BaseOS/x86_64/os/Packages/"$rpm_name"
     if [ ! -f "$download_dir/$rpm_name" ]
     then
       wget -P $download_dir https://mirrors.aliyun.com/centos-stream/9-stream/AppStream/x86_64/os/Packages/"$rpm_name"
     fi
     if [ ! -f "$download_dir/$rpm_name" ]
     then
       echo "$rpm_name download failed"
     fi
   done
   
   

4. Install all

   rpm -ivh --nodeps *.rpm
   

Not only centos9, 7 and 8, but also redhat can do this.

centos9 network configuration

It is slightly different from 7. Centos7 configures the network in the /etc/sysconfig/network-scripts/ifcfg-ensxxx file. The file will be automatically generated after the system is installed. In centos9, there is a readme file in this directory. It shows that this configuration file has been deprecated, and the new format configuration file is in /etc/NetworkManager/system-connections/ensxxx.nmconnection.

[connection]
id=ens160
uuid=c937dff4-3319-3289-9fea-f640eb95c79e
type=ethernet
autoconnect-priority=-999
interface-name=ens160
timestamp=1699658293

[ethernet]

[ipv4]
# Manual mode
method=manual
# dns, separate multiple ones with semicolons
dns=192.168.8.2
# gateway
gateway=192.168.8.2
#ip/mask, multiple addresses separated by semicolons
address=192.168.8.3/24

[ipv6]
addr-gen-mode=eui64
method=auto

[proxy]

After the configuration is complete, restart NetworkManager

systemctl restart NetworkManager

centos9 mirror source

Centos9 is still relatively new, and I haven’t found a relatively complete mirror source configuration on the Internet. Here is an Alibaba source that I configured myself.

centos-aliyun.repo

[baseos]
name=CentOS Stream $releasever - BaseOS
# metalink=https://mirrors.centos.org/metalink?repo=centos-baseos-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/BaseOS/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=1

[baseos-debuginfo]
name=CentOS Stream $releasever - BaseOS - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-baseos-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/BaseOS/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[baseos-source]
name=CentOS Stream $releasever - BaseOS - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-baseos-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/BaseOS/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[appstream]
name=CentOS Stream $releasever - AppStream
# metalink=https://mirrors.centos.org/metalink?repo=centos-appstream-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/AppStream/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=1

[appstream-debuginfo]
name=CentOS Stream $releasever - AppStream - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-appstream-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/AppStream/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[appstream-source]
name=CentOS Stream $releasever - AppStream - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-appstream-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/AppStream/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[crb]
name=CentOS Stream $releasever-CRB
# metalink=https://mirrors.centos.org/metalink?repo=centos-crb-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/CRB/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

[crb-debuginfo]
name=CentOS Stream $releasever - CRB - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-crb-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/CRB/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[crb-source]
name=CentOS Stream $releasever - CRB - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-crb-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/CRB/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

centos-addons-aliyun.repo

[highavailability]
name=CentOS Stream $releasever - HighAvailability
# metalink=https://mirrors.centos.org/metalink?repo=centos-highavailability-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/HighAvailability/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

[highavailability-debuginfo]
name=CentOS Stream $releasever - HighAvailability - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-highavailability-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/HighAvailability/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[highavailability-source]
name=CentOS Stream $releasever - HighAvailability - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-highavailability-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/HighAvailability/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[nfv]
name=CentOS Stream $releasever - NFV
# metalink=https://mirrors.centos.org/metalink?repo=centos-nfv-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/NFV/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

[nfv-debuginfo]
name=CentOS Stream $releasever - NFV - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-nfv-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/NFV/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[nfv-source]
name=CentOS Stream $releasever - NFV - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-nfv-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/NFV/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[rt]
name=CentOS Stream $releasever-RT
# metalink=https://mirrors.centos.org/metalink?repo=centos-rt-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/RT/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

[rt-debuginfo]
name=CentOS Stream $releasever - RT - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-rt-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/RT/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[rt-source]
name=CentOS Stream $releasever - RT - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-rt-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/RT/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[resilient storage]
name=CentOS Stream $releasever - ResilientStorage
# metalink=https://mirrors.centos.org/metalink?repo=centos-resilientstorage-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/ResilientStorage/$basearch/os/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=0

[resilientstorage-debuginfo]
name=CentOS Stream $releasever - ResilientStorage - Debug
# metalink=https://mirrors.centos.org/metalink?repo=centos-resilientstorage-debug-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/ResilientStorage/$basearch/debug/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[resilientstorage-source]
name=CentOS Stream $releasever - ResilientStorage - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-resilientstorage-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
baseurl=https://mirrors.aliyun.com/centos-stream/$stream/ResilientStorage/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0

[extras-common]
name=CentOS Stream $releasever-Extras packages
# metalink=https://mirrors.centos.org/metalink?repo=centos-extras-sig-extras-common-$stream & amp;arch=$basearch & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Extras-SHA512
baseurl=https://mirrors.aliyun.com/centos-stream/SIGs/$stream/extras/$basearch/extras-common/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
countme=1
enabled=1

[extras-common-source]
name=CentOS Stream $releasever - Extras packages - Source
# metalink=https://mirrors.centos.org/metalink?repo=centos-extras-sig-extras-common-source-$stream & amp;arch=source & amp;protocol=https,http
# gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Extras-SHA512
baseurl=https://mirrors.aliyun.com/centos-stream/SIGs/$stream/extras/source/
gpgkey=https://mirrors.aliyun.com/centos-stream/RPM-GPG-KEY-CentOS-Official
gpgcheck=1
repo_gpgcheck=0
metadata_expire=6h
enabled=0