基于centos7.3安装部署jewel版本ceph集群实战演练
一、环境准备[*] 安装centos7.3虚拟机三台
由于官网源与网盘下载速度都非常的慢，所以给大家提供了国内的搜狐镜像源：http://mirrors.sohu.com/centos/7.3.1611/isos/x86_64/CentOS-7-x86_64-DVD-1611.iso
[*] 在三台装好的虚拟机上分别加三块100G的硬盘。如图所示：
https://s1.运维网.com/wyfs02/M01/05/D6/wKiom1mtEGDR_SshAAAtTQt60ms370.png
3.配置ip
ceph-1ceph-2ceph-3192.168.42.200192.168.42.201192.168.42.203 修改可参照下面的配置文件即可
# vim /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
NAME=ens33
DEVICE=ens33
ONBOOT=yes
IPADDR=192.168.42.200
GATEWAY=192.168.42.2
NETMASK=255.255.255.0
DNS1=8.8.8.8
DNS2=8.8.4.4
# systemctl restart network4.修改yum源，官网的yum源可能会很慢，所以可以添加ali的
# yum clean all
# curl http://mirrors.aliyun.com/repo/Centos-7.repo >/etc/yum.repos.d/CentOS-Base.repo
# curl http://mirrors.aliyun.com/repo/epel-7.repo >/etc/yum.repos.d/epel.repo
# sed -i '/aliyuncs/d' /etc/yum.repos.d/CentOS-Base.repo
# sed -i '/aliyuncs/d' /etc/yum.repos.d/epel.repo
# yum makecache 5.修改主机名和安装一些软件
# 6.最后的工作，将各个主机的IP加入各自的/etc/hosts中
# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.42.200ceph-1
192.168.42.201ceph-2
192.168.42.202ceph-3
7.重启服务器环境生效。
二、集群搭建
1.集群配置如下：
主机IP功能ceph-1192.168.42.200deploy、mon*1、osd*3ceph-2192.168.42.201mon*1、 osd*3ceph-3192.168.42.202mon*1 、osd*3
2.环境清理
如果之前部署失败了，不必删除ceph客户端，或者重新搭建虚拟机，只需要在每个节点上执行如下指令即可将环境清理至刚安装完ceph客户端时的状态！强烈建议在旧集群上搭建之前清理干净环境，否则会发生各种异常情况。
# ps aux|grep ceph |awk '{print $2}'|xargs kill -9
# ps aux|grep ceph #确保所有进程已经结束
ps -ef|grep ceph
#确保此时所有ceph进程都已经关闭！！！如果没有关闭，多执行几次。
umount /var/lib/ceph/osd/*
rm -rf /var/lib/ceph/osd/*
rm -rf /var/lib/ceph/mon/*
rm -rf /var/lib/ceph/mds/*
rm -rf /var/lib/ceph/bootstrap-mds/*
rm -rf /var/lib/ceph/bootstrap-osd/*
rm -rf /var/lib/ceph/bootstrap-rgw/*
rm -rf /var/lib/ceph/tmp/*
rm -rf /etc/ceph/*
rm -rf /var/run/ceph/*
3.yum源及ceph的安装
需要在每个主机上执行以下指令
yum clean all
rm -rf /etc/yum.repos.d/*.repo
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
sed -i '/aliyuncs/d' /etc/yum.repos.d/CentOS-Base.repo
sed -i '/aliyuncs/d' /etc/yum.repos.d/epel.repo
sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo 4.增加ceph的源
vim /etc/yum.repos.d/ceph.repo
添加以下内容：
name=ceph
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/x86_64/
gpgcheck=0
name=cephnoarch
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/noarch/
gpgcheck=0 5.安装ceph客户端：
yum makecache
yum install ceph ceph-radosgw rdate -y
关闭selinux&firewalld
sed -i 's/SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
setenforce 0
systemctl stop firewalld
systemctl disable firewalld
同步各个节点时间：
yum -y install rdate
rdate -s time-a.nist.gov
echo rdate -s time-a.nist.gov >> /etc/rc.d/rc.local
chmod +x /etc/rc.d/rc.local 6.开始部署
在部署节点(ceph-1)安装ceph-deploy，下文的部署节点统一指ceph-1:
# yum -y install ceph-deploy
# ceph-deploy --version
1.5.34
# ceph -v
ceph version 10.2.2 (45107e21c568dd033c2f0a3107dec8f0b0e58374) 7.在部署节点创建部署目录并开始部署：
# cd
# mkdir cluster
# cd cluster/
# ceph-deploy new ceph-1 ceph-2 ceph-3 如果之前没有ssh-copy-id到各个节点，则需要输入一下密码，过程log如下：
found configuration file at: /root/.cephdeploy.conf
Invoked (1.5.34): /usr/bin/ceph-deploy new ceph-1 ceph-2 ceph-3
ceph-deploy options:
username : None
func :
verbose : False
overwrite_conf : False
quiet : False
cd_conf :
cluster : ceph
ssh_copykey : True
mon : ['ceph-1', 'ceph-2', 'ceph-3']
..
..
ceph_deploy.new] could not connect via SSH
will connect again with password prompt
The authenticity of host 'ceph-2 (192.168.57.223)' can't be established.
ECDSA key fingerprint is ef:e2:3e:38:fa:47:f4:61:b7:4d:d3:24:de:d4:7a:54.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ceph-2,192.168.57.223' (ECDSA) to the list of known hosts.
root
root@ceph-2's password:
connected to host: ceph-2 ..
..
Resolving host ceph-3
Monitor ceph-3 at 192.168.57.224
Monitor initial members are ['ceph-1', 'ceph-2', 'ceph-3']
Monitor addrs are ['192.168.57.222', '192.168.57.223', '192.168.57.224']
Creating a random mon key...
Writing monitor keyring to ceph.mon.keyring...
Writing initial config to ceph.conf...
此时，目录内容如下：
# ls
ceph.confceph-deploy-ceph.logceph.mon.keyring 8.根据自己的IP配置向ceph.conf中添加public_network，并稍微增大mon之间时差允许范围(默认为0.05s，现改为2s)：
# echo public_network=192.168.57.0/24 >> ceph.conf
# echo mon_clock_drift_allowed = 2 >> ceph.conf
# cat ceph.conf
fsid = 0248817a-b758-4d6b-a217-11248b098e10
mon_initial_members = ceph-1, ceph-2, ceph-3
mon_host = 192.168.57.222,192.168.57.223,192.168.57.224
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
public_network=192.168.57.0/24
mon_clock_drift_allowed = 2 9.开始部署monitor:
# ceph-deploy mon create-initial
..
..若干log
# ls
ceph.bootstrap-mds.keyringceph.bootstrap-rgw.keyringceph.conf ceph.mon.keyring
ceph.bootstrap-osd.keyringceph.client.admin.keyring ceph-deploy-ceph.log 10.查看集群状态：
# ceph -s
cluster 0248817a-b758-4d6b-a217-11248b098e10
health HEALTH_ERR
no osds
Monitor clock skew detected
monmap e1: 3 mons at {ceph-1=192.168.57.222:6789/0,ceph-2=192.168.57.223:6789/0,ceph-3=192.168.57.224:6789/0}
election epoch 6, quorum 0,1,2 ceph-1,ceph-2,ceph-3
osdmap e1: 0 osds: 0 up, 0 in
flags sortbitwise
pgmap v2: 64 pgs, 1 pools, 0 bytes data, 0 objects
0 kB used, 0 kB / 0 kB avail
64 creating 11.开始部署OSD:
ceph-deploy --overwrite-conf osd prepare ceph-1:/dev/sdb ceph-1:/dev/sdc ceph-1:/dev/sdd ceph-2:/dev/sdb ceph-2:/dev/sdc ceph-2:/dev/sdd ceph-3:/dev/sdb ceph-3:/dev/sdc ceph-3:/dev/sdd--zap-disk
ceph-deploy --overwrite-conf osd activate ceph-1:/dev/sdb1 ceph-1:/dev/sdc1 ceph-1:/dev/sdd1 ceph-2:/dev/sdb1 ceph-2:/dev/sdc1 ceph-2:/dev/sdd1 ceph-3:/dev/sdb1 ceph-3:/dev/sdc1 ceph-3:/dev/sdd1 我在部署的时候出了个小问题，有一个OSD没成功(待所有OSD部署完毕后，再重新部署问题OSD即可解决)，如果不出意外的话，集群状态应该如下：
# ceph -s
cluster 0248817a-b758-4d6b-a217-11248b098e10
health HEALTH_WARN
too few PGs per OSD (21 < min 30)
monmap e1: 3 mons at {ceph-1=192.168.57.222:6789/0,ceph-2=192.168.57.223:6789/0,ceph-3=192.168.57.224:6789/0}
election epoch 22, quorum 0,1,2 ceph-1,ceph-2,ceph-3
osdmap e45: 9 osds: 9 up, 9 in
flags sortbitwise
pgmap v82: 64 pgs, 1 pools, 0 bytes data, 0 objects
273 MB used, 16335 GB / 16336 GB avail
64 active+clean 12.去除这个WARN，只需要增加rbd池的PG就好：
# ceph osd pool set rbd pg_num 128
set pool 0 pg_num to 128
# ceph osd pool set rbd pgp_num 128
set pool 0 pgp_num to 128
# ceph -s
cluster 0248817a-b758-4d6b-a217-11248b098e10
health HEALTH_ERR
19 pgs are stuck inactive for more than 300 seconds
12 pgs peering
19 pgs stuck inactive
monmap e1: 3 mons at {ceph-1=192.168.57.222:6789/0,ceph-2=192.168.57.223:6789/0,ceph-3=192.168.57.224:6789/0}
election epoch 22, quorum 0,1,2 ceph-1,ceph-2,ceph-3
osdmap e49: 9 osds: 9 up, 9 in
flags sortbitwise
pgmap v96: 128 pgs, 1 pools, 0 bytes data, 0 objects
308 MB used, 18377 GB / 18378 GB avail
103 active+clean
12 peering
9 creating
4 activating# ceph -s
cluster 0248817a-b758-4d6b-a217-11248b098e10
health HEALTH_OK
monmap e1: 3 mons at {ceph-1=192.168.57.222:6789/0,ceph-2=192.168.57.223:6789/0,ceph-3=192.168.57.224:6789/0}
election epoch 22, quorum 0,1,2 ceph-1,ceph-2,ceph-3
osdmap e49: 9 osds: 9 up, 9 in
flags sortbitwise
pgmap v99: 128 pgs, 1 pools, 0 bytes data, 0 objects
310 MB used, 18377 GB / 18378 GB avail
128 active+clean 至此，集群部署完毕。
13.config推送
请不要使用直接修改某个节点的/etc/ceph/ceph.conf文件的方式，而是去部署节点(此处为ceph-1:/root/cluster/ceph.conf)目录下修改。因为节点到几十个的时候，不可能一个个去修改的，采用推送的方式快捷安全！
修改完毕后，执行如下指令，将conf文件推送至各个节点：
# ceph-deploy --overwrite-conf config push ceph-1 ceph-2 ceph-3 此时，需要重启各个节点的monitor服务，见下一节。
14.mon&osd启动方式
#monitor start/stop/restart
#ceph-1为各个monitor所在节点的主机名。
systemctl start ceph-mon@ceph-1.service
systemctl restart ceph-mon@ceph-1.service
systemctl stop ceph-mon@ceph-1.service
#OSD start/stop/restart
#0为该节点的OSD的id，可以通过`ceph osd tree`查看
systemctl start/stop/restart ceph-osd@0.service
# ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 17.94685 root default
-25.98228 host ceph-1
01.99409 osd.0 up1.00000 1.00000
11.99409 osd.1 up1.00000 1.00000
81.99409 osd.2 up1.00000 1.00000
-35.98228 host ceph-2
21.99409 osd.3 up1.00000 1.00000
31.99409 osd.4 up1.00000 1.00000
41.99409 osd.5 up1.00000 1.00000
-45.98228 host ceph-3
51.99409 osd.6 up1.00000 1.00000
61.99409 osd.7 up1.00000 1.00000
71.99409 osd.8 up1.00000 1.00000
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