Centos7 kernel upgrade & amp; started by default

Centos7 kernel upgrade & default startup
Centos7 kernel upgrade & default startup

Recently an Intel®Pentium®Processor J4205 machine, after installing centos7 found very slow, saw the start of said did not recognize the CPU, so go to the motherboard vendors official website to see what operating systems are supported, found to support Linux: ubuntu 16.10/Fedora 25, centos7 uses the kernel 3.10, and Fedora25 uses the kernel 4.9. So I upgraded the kernel for my centos 7:

• Kernel upgrade

• Default kernel startup

Yum source for Kernel upgrade and installation of elrepo:

rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm

Query the kernel

[ddd@localhost ~]$ yum --enablerepo=elrepo-kernel  list  |grep kernel* * elrepo-kernel: mirrors.tuna.tsinghua.edu.cnabrt-addon-kerneloops.x86_64            2.1.11-45.el7.centos           @anacondakernel.x86_64                           3.10.0-514.el7                 @anacondakernel.x86_64                           3.10.0-514.6.1.el7             @updates kernel-devel.x86_64                     3.10.0-514.el7                 @anacondakernel-devel.x86_64                     3.10.0-514.6.1.el7             @updates kernel-headers.x86_64                   3.10.0-514.6.1.el7             @updates kernel-ml.x86_64                        4.9.10-1.el7.elrepo            @elrepo-kernelkernel-ml-devel.x86_64                  4.9.10-1.el7.elrepo            @elrepo-kernelkernel-tools.x86_64                     3.10.0-514.6.1.el7             @updates kernel-tools-libs.x86_64                3.10.0-514.6.1.el7             @updates erlang-kernel.x86_64                    R16B-03.18.el7                 epel     kernel-abi-whitelists.noarch            3.10.0-514.6.1.el7             updates  kernel-debug.x86_64                     3.10.0-514.6.1.el7             updates  kernel-debug-devel.x86_64               3.10.0-514.6.1.el7             updates  kernel-doc.noarch                       3.10.0-514.6.1.el7             updates  kernel-lt.x86_64                        4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-devel.x86_64                  4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-doc.noarch                    4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-headers.x86_64                4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-tools.x86_64                  4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-tools-libs.x86_64             4.4.49-1.el7.elrepo            elrepo-kernelkernel-lt-tools-libs-devel.x86_64       4.4.49-1.el7.elrepo            elrepo-kernelkernel-ml-doc.noarch                    4.9.10-1.el7.elrepo            elrepo-kernelkernel-ml-headers.x86_64                4.9.10-1.el7.elrepo            elrepo-kernelkernel-ml-tools.x86_64                  4.9.10-1.el7.elrepo            elrepo-kernelkernel-ml-tools-libs.x86_64             4.9.10-1.el7.elrepo            elrepo-kernelkernel-ml-tools-libs-devel.x86_64       4.9.10-1.el7.elrepo            elrepo-kernelkernel-tools-libs-devel.x86_64          3.10.0-514.6.1.el7             updates  libreport-plugin-kerneloops.x86_64      2.1.11-35.el7.centos           base     lirc-disable-kernel-rc.x86_64           0.9.1a-4.el7                   epel     perf.x86_64                             4.9.10-1.el7.elrepo            elrepo-kernelphp-symfony-http-kernel.noarch          2.8.12-2.el7                   epel     python-perf.x86_64                      4.9.10-1.el7.elrepo            elrepo-kerneltexlive-l3kernel.noarch                 2:svn29409.SVN_4469-38.el7     base     texlive-l3kernel-doc.noarch             2:svn29409.SVN_4469-38.el7     base     [ddd@localhost ~]$ 

Install Kernel

In the ELRepo source of yum, the mainline is issued and can be installed as follows:

yum --enablerepo=elrepo-kernel install  kernel-ml-devel kernel-ml -y

Of course, you can also install long term:

yum --enablerepo=elrepo-kernel  install  kernel-lt -y

Default kernel startup

Open the grub2-efi.cfg and find CentOS Linux (4.9.10-1. el7.elrepo. x86_64) 7 (Core) replication

vim /etc/grub2-efi.cfg

Set the default startup Item

 grub2-set-default "CentOS Linux (4.9.10-1.el7.elrepo.x86_64) 7 (Core)"

Verify default startup items

grub2-editenv list