Keepalive+Atlas+DRBD+Heartbeat+mysql配置系列(一):安装DRBD
最近在虚拟机里用centos7搭建了一套Keepalive+Atlas+DRBD+Heartbeat+mysql环境,用来进行测试使用,本系列是我在搭建完后来进行编写的,可能会有点遗漏,大家将就看,我尽量做到详细.
系统:centos 7.x(64位)
环境ip:
node1(主节点)IP: 10.0.2.5 主机名:dbm5
node2(从节点)IP: 10.0.2.7 主机名:dbm7
虚拟IP地址(VIP): 10.0.2.10
1.安装准备
systemctl stop firewalld
systemctl disable firewalld
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
vi /etc/hosts
10.0.2.5 dbm5
10.0.2.7 dbm7
#改完后重启系统
init 6
2.磁盘规划,(dbm5和dbm7都要执行)
因为是虚拟机,把200G里的150G都给了/home,但我习惯了/data,故要进行更改.
umount /home
[root@dbm5 ~]# vi /etc/fstab
把/dev/mapper/centos-home /home xfs defaults 1 2
注释了,如下:
#/dev/mapper/centos-home /home xfs defaults 1 2
[root@dbm5 ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume home? [y/n]: y
Logical volume "home" successfully removed
[root@dbm5 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- 199.51g 143.62g
可以看到还有143.62G.
[root@dbm5 ~]# lvcreate -n db -L +143.6G centos
Rounding up size to full physical extent 143.60 GiB
WARNING: xfs signature detected on /dev/centos/db at offset 0. Wipe it? [y/n] y
Wiping xfs signature on /dev/centos/db.
Logical volume "db" created
[root@dbm5 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- 199.51g 16.00m
[root@dbm5 ~]# mkdir /data
ps:不管是普通分区,还是lv,drbd需要的是干净的分区,不要格式化.
3.时间同步(dbm5和dbm7都要执行)
yum -y install rdate
rdate -s time-b.nist.gov
4.安装drbd (dbm5和dbm7都要执行)
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
yum install -y kmod-drbd84 drbd84-utils
systemctl enable drbd
modprobe drbd
[root@dbm5 ~]# lsmod |grep drbd
drbd 397041 4
libcrc32c 12644 2 xfs,drbd
4.配置drbd
vi /etc/drbd.d/global_common.conf
global {
usage-count no; #是否提供DRBD进行分析
vi /etc/drbd.d/db.res
resource drbd0{
protocol C;
startup { wfc-timeout 0; degr-wfc-timeout 120;}
disk { on-io-error detach;}
net{
timeout 60;
connect-int 10;
ping-int 10;
max-buffers 2048;
max-epoch-size 2048;
}
syncer { rate 1000M;}
on dbm5 {
device /dev/drbd0;
disk /dev/centos/db;
address 10.0.2.5:7788;
meta-disk internal;
}
on dbm7 {
device /dev/drbd0;
disk /dev/centos/db;
address 10.0.2.7:7788;
meta-disk internal;
}
}
ps:
请修改上面配置中的主机名、IP、和disk为自己的具体配置.
5.创建DRBD设备并激活drbd0资源
[root@dbm5 ~]# mknod /dev/drbd0 b 147 0
[root@dbm5 ~]# drbdadm create-md drbd0
等待片刻,显示success表示drbd块创建成功
md_offset 1036290879488
al_offset 1036290846720
bm_offset 1036259221504
Found some data
==> This might destroy existing data! <==
Do you want to proceed?
[need to type 'yes' to confirm] yes
initializing activity log
initializing bitmap (30884 KB) to all zero
Writing meta data...
New drbd meta data block successfully created.
success
再执行一次:
[root@dbm5 ~]# drbdadm create-md drbd0
成功激活drbd0
You want me to create a v08 style flexible-size internal meta data block.
There appears to be a v08 flexible-size internal meta data block
already in place on /dev/centos/db at byte offset 1036290879488
Do you really want to overwrite the existing meta-data?
[need to type 'yes' to confirm] yes
md_offset 1036290879488
al_offset 1036290846720
bm_offset 1036259221504
Found some data
==> This might destroy existing data! <==
Do you want to proceed?
[need to type 'yes' to confirm] yes
initializing activity log
initializing bitmap (30884 KB) to all zero
Writing meta data...
New drbd meta data block successfully created.
两边都启动drbd:
drbdadm up drbd
查看drbd状态:
cat /proc/drbd
version: 8.4.11-1 (api:1/proto:86-101)
GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by mockbuild@, 2018-11-03 01:26:55
0: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
ps:因为还没有决定要以哪边资料为主，所以 ds:Inconsistent，两边都是 Secondary
把dbm5升为主:
[root@dbm5 ~]# drbdadm primary drbd0 --force
查看同步状态:
[root@dbm5 ~]# cat /proc/drbd
version: 8.4.11-1 (api:1/proto:86-101)
GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by mockbuild@, 2018-04-26 12:10:42
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
ns:286720 nr:0 dw:0 dr:288816 al:8 bm:0 lo:0 pe:1 ua:0 ap:0 ep:1 wo:f oos:1011686200
[>....................] sync'ed: 0.1% (987972/988252)M
finish: 6:52:41 speed: 40,812 (40,812) K/sec
只格式化dbm5的磁盘:
[root@dbm5 ~]# mkfs.xfs /dev/drbd0
ps:
备用节点会进行DRBD设备格式化的同步,所以千万不要再在备用节点去进行DRBD设备的格式化
把mysql data指定到/data里:
vim /etc/my.cnf
datadir=/data/mysql
在dbm5上挂载/dev/drbd0到/data
mount /dev/drbd0 /data
6.DRBD测试
drbdadm primary drbd0 #升级为primary
drbdadm secondary drbd0 #降级为secondary
没问题的话,就可以搭建Heartbeat来进行自动控制了.
ade
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