Centos7 更換內核到4.16的嘗試

背景：

特殊需求，須要使用kernel 4.x版本，在雲上ECS如何更換呢？

慫一下先：
請對生產環境，保持敬畏之心，務必作好快照備份！
請對生產環境，保持敬畏之心，務必作好快照備份！
請對生產環境，保持敬畏之心，務必作好快照備份！

1，看下內核先

# uname -r
3.10.0-514.26.2.el7.x86_64

2，升級內核須要先導入elrepo的key，而後安裝elrepo的yum源：

# rpm -import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
#  rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
Retrieving http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm
Retrieving http://elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
Preparing...                          ################################# [100%]
Updating / installing...
   1:elrepo-release-7.0-3.el7.elrepo  ################################# [100%]

3，看下源上的內核版本

# yum --disablerepo="*" --enablerepo="elrepo-kernel" list available
Loaded plugins: fastestmirror
elrepo-kernel                                                                                           | 2.9 kB  00:00:00     
elrepo-kernel/primary_db       FAILED                                                        ] 4.1 kB/s |  83 kB  00:06:58 ETA 
http://elrepo.org/linux/kernel/el7/x86_64/repodata/b970175c81e43b64f8ed487034e08db0f81ba50f2ba1a770606d4a85f7c3c1ab-primary.sqlite.bz2: [Errno 14] curl#18 - "transfer closed with 1740046 bytes remaining to read"
Trying other mirror.
elrepo-kernel/primary_db       FAILED                                          
http://mirrors.coreix.net/elrepo/kernel/el7/x86_64/repodata/b970175c81e43b64f8ed487034e08db0f81ba50f2ba1a770606d4a85f7c3c1ab-primary.sqlite.bz2: [Errno 14] curl#6 - "Could not resolve host: mirrors.coreix.net; Unknown error"
Trying other mirror.
elrepo-kernel/primary_db                                                                                | 1.7 MB  00:00:02     
Determining fastest mirrors
 * elrepo-kernel: mirrors.tuna.tsinghua.edu.cn
Available Packages
kernel-lt.x86_64                                               4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-devel.x86_64                                         4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-doc.noarch                                           4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-headers.x86_64                                       4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools.x86_64                                         4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools-libs.x86_64                                    4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-lt-tools-libs-devel.x86_64                              4.4.131-1.el7.elrepo                               elrepo-kernel
kernel-ml.x86_64                                               4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-devel.x86_64                                         4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-doc.noarch                                           4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-headers.x86_64                                       4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-tools.x86_64                                         4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-tools-libs.x86_64                                    4.16.8-1.el7.elrepo                                elrepo-kernel
kernel-ml-tools-libs-devel.x86_64                              4.16.8-1.el7.elrepo                                elrepo-kernel
perf.x86_64                                                    4.16.8-1.el7.elrepo                                elrepo-kernel
python-perf.x86_64                                             4.16.8-1.el7.elrepo                                elrepo-kernel

4，安裝內核