Configuring the Yum Source

Configure the yum source properly to install the required software and dependencies. Select the appropriate yum configuration method based on your network condition and OS type.

If the Internet connection is available, see Configuring the Internet Yum Source (CentOS) for CentOS and Configuring the Internet Yum Source (openEuler) for openEuler.
If the Internet connection is unavailable, see Configuring the Local Yum Source (CentOS & openEuler).

Configuring the Internet Yum Source (CentOS)

Run the curl command to access any website. If the website information is displayed, the proxy is successfully configured and the Internet is connected.
Check for the yum source (a .repo file). If it is available, go to 6.
1
ls /etc/yum.repos.d/

Back up the yum source to the bak directory.

cd /etc/yum.repos.d
mkdir bak
mv *.repo bak

Configure the Internet yum source.

CentOS 7.6:

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.huaweicloud.com/repository/conf/CentOS-AltArch-7.repo

If wget is not installed, run the following command to install it:

yum -y install wget

View the yum source.

CentOS 7.6:

ls /etc/yum.repos.d/
cat /etc/yum.repos.d/CentOS-Base.repo

Make the yum source take effect.

yum clean all
yum makecache
yum list

Configuring the Internet Yum Source (openEuler)

Run the curl command to access any website. If the website information is displayed, the proxy is successfully configured and the Internet is connected.
Check for the yum source (a .repo file). If it is available, go to 7.
```
ls /etc/yum.repos.d/
```

Back up the yum source to the bak directory.

cd /etc/yum.repos.d
mkdir bak
mv *.repo bak

Open the file.
```
vi /etc/yum.repos.d/openEuler.repo
```

Press i to enter the insert mode.

If the OS is openEuler 20.03, modify the file content as follows:

[OS]
name=OS
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler
[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/EPOL/update/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler
[debuginfo]
name=debuginfo
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/debuginfo/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/debuginfo/$basearch/RPM-GPG-KEY-openEuler
[source]
name=source
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/source/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/source/RPM-GPG-KEY-openEuler
[update]
name=update
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/update/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler
[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-20.03-LTS-SP1/everything/$basearch/RPM-GPG-KEY-openEuler

If the OS is openEuler 22.03, modify the file content as follows:

[OS]
name=OS
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/OS/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler

[everything]
name=everything
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/everything/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/everything/$basearch/RPM-GPG-KEY-openEuler

[EPOL]
name=EPOL
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/EPOL/main/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler

[debuginfo]
name=debuginfo
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/debuginfo/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/debuginfo/$basearch/RPM-GPG-KEY-openEuler

[source]
name=source
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/source/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/source/RPM-GPG-KEY-openEuler

[update]
name=update
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/update/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/OS/$basearch/RPM-GPG-KEY-openEuler

[update-source]
name=update-source
baseurl=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/update/source/
enabled=1
gpgcheck=1
gpgkey=http://repo.openeuler.org/openEuler-22.03-LTS-SP1/source/RPM-GPG-KEY-openEuler

Press Esc to exit the insert mode. Type :wq! and press Enter to save the file and exit.

Make the yum source take effect.

yum clean all
yum makecache
yum list

Configuring the Local Yum Source (CentOS & openEuler)

Download the OS image file.
OS image addresses:
- CentOS 7.6 image: https://mirrors.huaweicloud.com/centos-vault/altarch/7.6.1810/isos/aarch64/CentOS-7-aarch64-Everything-1810.iso
- openEuler 22.03 LTS SP1 image: https://repo.huaweicloud.com/openeuler/openEuler-22.03-LTS-SP1/ISO/aarch64/openEuler-22.03-LTS-SP1-everything-aarch64-dvd.iso
- openEuler 20.03 LTS SP1 image: https://repo.huaweicloud.com/openeuler/openEuler-20.03-LTS-SP1/ISO/aarch64/openEuler-20.03-LTS-SP1-everything-aarch64-dvd.iso
Mount the OS image file.
- Method 1: Upload the OS image file to the /root directory and mount it to the /mnt directory.
  - CentOS 7.6:
    1
    mount /root/CentOS-7-aarch64-Everything-1810.iso /mnt
  - openEuler 20.03:
    1
    mount /root/openEuler-20.03-LTS-SP1-everything-aarch64-dvd.iso /mnt
  - openEuler 22.03:
```
mount /root/openEuler-22.03-LTS-SP1-everything-aarch64-dvd.iso /mnt
```
    Rename the ISO file based on your requirements. The renaming operation takes effect only once and becomes invalid after a system restart. You can perform the following operations for the image file to be automatically mounted upon system startup.
    Open the fstab file.
    1
    vim /etc/fstab
    
    Press i to enter the insert mode and add the following content to the end of the file:
    CentOS 7.6:
    1
    /root/CentOS-7-aarch64-Everything-1810.iso /mnt iso9660 loop 0 0
    
    openEuler 20.03:
    1
    /root/openEuler-20.03-LTS-SP1-everything-aarch64-dvd.iso /mnt iso9660 loop 0 0
    
    openEuler 22.03:
    /root/openEuler-22.03-LTS-SP1-everything-aarch64-dvd.iso /mnt iso9660 loop 0 0
    
    Press Esc, type :wq!, and press Enter to save the file and exit.
- Method 2: Use a browser to log in to the BMC and use the KVM to load the OS image file.
  1. Check the device symbol corresponding to the OS image.
```
ls /dev/sr*
```
  2. Mount the OS image file to the /mnt directory.
```
mount /dev/sr0 /mnt
df -h | grep /mnt
ls /mnt/
```
    /dev/sr0 is the device symbol corresponding to the OS image, which must be the same as that queried in 2.a.

Back up the yum source.

cd /etc/yum.repos.d
mkdir bak
mv *.repo bak

Configure the local yum source.
1. Go to the /etc/yum.repos.d directory.
  1
  cd /etc/yum.repos.d
2. Create a local.repo file.
  1. Open the local.repo file.
    1
    vim local.repo
  2. Press i to enter the insert mode and add the following content to the file:
    1 2 3 4 5
    [local] name=local.repo baseurl=file:///mnt enabled=1 gpgcheck=0
    In baseurl, the file path indicates the path for mounting the image, which is the directory /mnt in 2.
  3. Press Esc, type :wq!, and press Enter to save the file and exit.
  4. View the local.repo file.
```
cat local.repo
```

Make the yum source take effect.

yum clean all
yum makecache
yum list

Parent topic: Configuring the Compilation Environment