甲骨文的免费Arm主机开始申请的时候没注意选了 Oracle Linux 8 系统而没选自己更熟悉的Ubuntu ，导致各种折腾的时候发现资料有点少，今天折腾一个云安卓 redroid 系统的时候发现需要编译一些内核模块，而默认的 5.4 内核一直编译失败，于是想到升级内核试试，一路搜索找不到很符合的文章，于是自己摸索了一下，记录于此。
1. 查看已经安装的内核包
➜ client yum list installed | grep kernel
kernel-headers.aarch64 4.18.0-477.13.1.el8_8 @ol8_baseos_latest
kernel-tools.aarch64 4.18.0-477.13.1.el8_8 @ol8_baseos_latest
kernel-tools-libs.aarch64 4.18.0-477.13.1.el8_8 @ol8_baseos_latest
kernel-uek.aarch64 5.4.17-2136.307.3.1.el8uek @ol8_baseos_latest
kernel-uek.aarch64 5.4.17-2136.309.4.el8uek @ol8_baseos_latest
kernel-uek.aarch64 5.4.17-2136.320.7.1.el8uek @ol8_baseos_latest
kernel-uek-devel.aarch64 5.4.17-2136.307.3.1.el8uek @ol8_baseos_latest
kernel-uek-devel.aarch64 5.4.17-2136.309.4.el8uek @ol8_baseos_latest
kernel-uek-devel.aarch64 5.4.17-2136.320.7.1.el8uek @ol8_baseos_latest
可以看到我们的内核都是baseos仓库安装的内核，该仓库内核版本比较老，查看 官网仓库 列表，内核仓库有了更新的包。
内核版本为 5.15.0
2. 安装内核
先看下已有的 yum 库
➜ sudo yum repolist
repo id repo name
docker-ce-nightly Docker CE Nightly - aarch64
docker-ce-stable Docker CE Stable - aarch64
docker-ce-test Docker CE Test - aarch64
epel Extra Packages for Enterprise Linux 8 - aarch64
nginx-stable nginx stable repo
ol8_MySQL80 MySQL 8.0 for Oracle Linux 8 (aarch64)
ol8_MySQL80_connectors_community MySQL 8.0 Connectors Community for Oracle Linux 8 (aarch64)
ol8_MySQL80_tools_community MySQL 8.0 Tools Community for Oracle Linux 8 (aarch64)
ol8_addons Oracle Linux 8 Addons (aarch64)
ol8_appstream Oracle Linux 8 Application Stream (aarch64)
ol8_baseos_latest Oracle Linux 8 BaseOS Latest (aarch64)
ol8_developer_EPEL Oracle Linux 8 EPEL Packages for Development (aarch64)
ol8_ksplice Ksplice for Oracle Linux 8 (aarch64)
ol8_oci_included Oracle Software for OCI users on Oracle Linux 8 (aarch64)
没有包含Release 7的这个内核仓库，现在添加一下：
sudo yum-config-manager --add-repo http://yum.oracle.com/repo/OracleLinux/OL8/UEKR7/aarch64
检查一下是否添加成功
➜ ~ sudo yum repolist
repo id repo name
docker-ce-nightly Docker CE Nightly - aarch64
docker-ce-stable Docker CE Stable - aarch64
docker-ce-test Docker CE Test - aarch64
epel Extra Packages for Enterprise Linux 8 - aarch64
nginx-stable nginx stable repo
ol8_MySQL80 MySQL 8.0 for Oracle Linux 8 (aarch64)
ol8_MySQL80_connectors_community MySQL 8.0 Connectors Community for Oracle Linux 8 (aarch64)
ol8_MySQL80_tools_community MySQL 8.0 Tools Community for Oracle Linux 8 (aarch64)
ol8_addons Oracle Linux 8 Addons (aarch64)
ol8_appstream Oracle Linux 8 Application Stream (aarch64)
ol8_baseos_latest Oracle Linux 8 BaseOS Latest (aarch64)
ol8_developer_EPEL Oracle Linux 8 EPEL Packages for Development (aarch64)
ol8_ksplice Ksplice for Oracle Linux 8 (aarch64)
ol8_oci_included Oracle Software for OCI users on Oracle Linux 8 (aarch64)
yum.oracle.com_repo_OracleLinux_OL8_UEKR7_aarch64 created by dnf config-manager from http://yum.oracle.com/repo/OracleLinux/OL8/UEKR7/aarch64
最后再更新一下:
sudo yum update
可已查看到将要更新的包了，同时 yum 会自动移除旧的内核，这里是同时升级仓库中所有已安装的包版本，如果只想升级内核可以使用 sudo yum update kernel\*
最后重启一下
reboot
3. 验证内核安装
➜ ~ uname -r
5.15.0-200.131.27.el8uek.aarch64
新的内核已经安装成功！