Docker安装及centos内核升级
1.安装docker[root@gmdai ~]# sudo yum installhttp://mirrors.yun-idc.com/epel/6/i386/epel-release-6-8.noarch.rpm
[root@gmdai ~]# sudo yum install docker-io
[root@gmdai ~]# service docker start
[root@gmdai ~]# chkconfig docker on
[root@gmdai ~]# yum install git -y
2.内核版本太低,升级内核[root@gmdai ~]# docker pulldaocloud.io/library/nginx:1.9.9 //pull镜像时报错让执行docker -d
Cannot connect to the Docker daemon. Is 'docker-d' running on this host?
[root@gmdai ~]# docker -d
WARN[0000] You are running linux kernel version2.6.32-431.el6.x86_64, which might be unstable running docker. Please upgradeyour kernel to 3.10.0. //提示内核版本号太低
INFO[0000] Listening for HTTP on unix(/var/run/docker.sock)
3.升级内核rpm -ivh http://www.elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernelinstallkernel-ml -y
4.编辑grub.conf文件,修改Grub引导顺序
vim /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub aftermaking changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/sda1
# initrd /boot/initrd-[generic-]version.img
#boot=/dev/sda
default=0
timeout=5
splashp_w_picpath=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (4.4.0-1.el6.elrepo.x86_64)
root (hd0,0)
kernel /vmlinuz-4.4.0-1.el6.elrepo.x86_64 ro root=/dev/mapper/vg_gmdai-lv_rootrd_NO_LUKS rd_LVM_LV=vg_gmdai/lv_swap rd_NO_MD rd_LVM_LV=vg_gmdai/lv_rootcrashkernel=auto.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-4.4.0-1.el6.elrepo.x86_64.img
title CentOS (2.6.32-431.el6.x86_64)
root (hd0,0)
kernel /vmlinuz-2.6.32-431.el6.x86_64 roroot=/dev/mapper/vg_gmdai-lv_root rd_NO_LUKS rd_LVM_LV=vg_gmdai/lv_swap rd_NO_MDrd_LVM_LV=vg_gmdai/lv_root crashkernel=auto.UTF-8 KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgbquiet
initrd /initramfs-2.6.32-431.el6.x86_64.img
确认刚安装好的内核在哪个位置,然后设置default值(从0开始),一般新安装的内核在第一个位置,所以设置default=0。
5、重启,查看内核版本号
[root@gmdai ~]# uname -r
4.4.0-1.el6.elrepo.x86_64