一.切换到更换目录

cd /etc/yum.repos.d/

cp openEuler.repo openEuler.repo.bak

vim openEuler.repo 

#generic-repos is licensed under the Mulan PSL v2.
#You can use this software according to the terms and conditions of the Mulan PSL v2.
#You may obtain a copy of Mulan PSL v2 at:
#    http://license.coscl.org.cn/MulanPSL2
#THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
#PURPOSE.
#See the Mulan PSL v2 for more details.

[OS]
name=OS
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/EPOL/main/$basearch/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/OS/$basearch/RPM-GPG-KEY-openEuler

[debuginfo]
name=debuginfo
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/debuginfo/$basearch/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/debuginfo/$basearch/RPM-GPG-KEY-openEuler

[source]
name=source
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/source/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/source/RPM-GPG-KEY-openEuler

[update]
name=update
baseurl= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/update/$basearch/
enabled=1
gpgcheck=1
gpgkey= https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP3/OS/$basearch/RPM-GPG-KEY-openEuler


二.使yum源生效

使原有源失效: sudo yum clean all
使用新源: sudo yum makecache
最后在 yum update就行啦

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