Ceph集群搭建
一、 环境准备(三台服务器一样的配置)
操作系统平台：centos7.3
1.关闭firewalld与selinux
2.每台服务器添加3块100G硬盘
3.配置ip
| centos-01 |
centos-02 |
centos-03 |
| 192.168.0.118 |
192.168.0.119 |
192.168.0.120 |
4.修改yum源，官网的yum源可能会很慢，所以可以添加ali的
[root@localhost ~ ]# yum clean all
[root@localhost ~ ]# curl http://mirrors.aliyun.com/repo/Centos-7.repo >/etc/yum.repos.d/CentOS-Base.repo
[root@localhost ~ ]# curl http://mirrors.aliyun.com/repo/epel-7.repo >/etc/yum.repos.d/epel.repo
[root@localhost ~ ]# sed -i '/aliyuncs/d' /etc/yum.repos.d/CentOS-Base.repo
[root@localhost ~ ]# sed -i '/aliyuncs/d' /etc/yum.repos.d/epel.repo
[root@localhost ~ ]#sed -i 's/$releasever/7/g' /etc/yum.repos.d/CentOS-Base.repo
[root@localhost ~ ]# yum makecache
5.修改静态解析文件/etc/hosts
[root@localhost ~ ]# vim /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.0.118 centos-01
192.168.0.119 centos-02
二、集群搭建
1.集群配置如下：
| 主机 |
IP |
功能 |
| centos-01 |
192.168.0.118 |
deploy、mon*1、osd*3 |
| centos-02 |
192.168.0.119 |
mon*1、 osd*3 |
| centos-03 |
192.168.0.120 |
mon*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。
[root@ceph-1 cluster]# ps aux|grep ceph |awk '{print $2}'|xargs kill -9
[root@ceph-1 cluster]# ps aux|grep ceph #确保所有进程已经结束
ps -ef|grep ceph
#确保此时所有ceph进程都已经关闭！！！如果没有关闭，多执行几次。
umount /var/lib/ceph/osd/*
rm -rf /var/lib/ceph/osd/*
rm -rf /var/lib/ceph/mon/*
rm -rf /var/lib/ceph/mds/*
rm -rf /var/lib/ceph/bootstrap-mds/*
rm -rf /var/lib/ceph/bootstrap-osd/*
rm -rf /var/lib/ceph/bootstrap-rgw/*
rm -rf /var/lib/ceph/tmp/*
rm -rf /etc/ceph/*
rm -rf /var/run/ceph/*
如果在任何时候遇到问题并想重新开始，请执行以下操作清除Ceph软件包，并清除所有数据和配置：
ceph-deploy purge node1 node2
ceph-deploy purgedata node1 node2
ceph-deploy forgetkeys && rm ceph.*
sed -i 's/$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：
[ceph]
name=ceph
baseurl=http://mirrors.163.com/ceph/rpm-jewel/el7/x86_64/
gpgcheck=0
[ceph-noarch]
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 -y
6.开始部署
在部署节点(centos-01)生成ssh秘钥对，并将公钥上传至centos-02、centos-03
[root@centos-01 ~]# ssh-keygen
[root@centos-01 ~]# ssh-copy-id root@centos-02
[root@centos-01 ~]# ssh-copy-id root@centos-03
在部署节点(centos-01)安装ceph-deploy，下文的部署节点统一指centos-01:
[root@centos-01 ~]# yum -y install ceph-deploy
[root@ centos-01 ~]# ceph-deploy --version
1.5.39
[root@ centos-01 ~]# ceph -v
ceph version 10.2.11 (e4b061b47f07f583c92a050d9e84b1813a35671e)
7.在部署节点创建部署目录并开始部署：
[root@ centos-01 ~]# cd
[root@ centos-01 ~]# mkdir cluster
[root@ centos-01 ~]# cd cluster/
[root@ centos-01 cluster]# ceph-deploy new centos-01 centos-02 centos-03
[ceph_deploy.conf][DEBUG ] found configuration file at: /root/.cephdeploy.conf
[ceph_deploy.cli][INFO ] Invoked (1.5.34): /usr/bin/ceph-deploy new ceph-1 ceph-2 ceph-3
[ceph_deploy.cli][INFO ] ceph-deploy options:
[ceph_deploy.cli][INFO ] username : None
[ceph_deploy.cli][INFO ] func : <function new at 0x7f91781f96e0>
[ceph_deploy.cli][INFO ] verbose : False
[ceph_deploy.cli][INFO ] overwrite_conf : False
[ceph_deploy.cli][INFO ] quiet : False
[ceph_deploy.cli][INFO ] cd_conf : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f917755ca28>
[ceph_deploy.cli][INFO ] cluster : ceph
[ceph_deploy.cli][INFO ] ssh_copykey : True
[ceph_deploy.cli][INFO ] mon : ['ceph-1', 'ceph-2', 'ceph-3']
..
..
ceph_deploy.new][WARNIN] could not connect via SSH
[ceph_deploy.new][INFO ] 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:
[ceph-2][DEBUG ] connected to host: ceph-2
..
..
[ceph_deploy.new][DEBUG ] Resolving host ceph-3
[ceph_deploy.new][DEBUG ] Monitor ceph-3 at 192.168.57.224
[ceph_deploy.new][DEBUG ] Monitor initial members are ['ceph-1', 'ceph-2', 'ceph-3']
[ceph_deploy.new][DEBUG ] Monitor addrs are ['192.168.57.222', '192.168.57.223', '192.168.57.224']
[ceph_deploy.new][DEBUG ] Creating a random mon key...
[ceph_deploy.new][DEBUG ] Writing monitor keyring to ceph.mon.keyring...
[ceph_deploy.new][DEBUG ] Writing initial config to ceph.conf...
此时，目录内容如下：
[root@ centos-01 cluster]# ls
ceph.conf ceph-deploy-ceph.log ceph.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)：
[root@ centos-01 cluster]# echo public_network=192.168.0.0/24 >> ceph.conf
[root@ centos-01 cluster]# echo mon_clock_drift_allowed = 2 >> ceph.conf
[root@ centos-01 cluster]# cat ceph.conf
[global]
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:
[root@ centos-01 cluster]# ceph-deploy mon create-initial
..
..若干log
如果ceph-deploy mon create-initial 报错“ [Errno 2] No such file or directory”
解决方法：修改主机名，清理环境
推送配置文件 #ceph-deploy --overwrite-conf config push node1 node2 node3
[root@ centos-01 cluster]# ls
ceph.bootstrap-mds.keyring ceph.bootstrap-rgw.keyring ceph.conf ceph.mon.keyring
ceph.bootstrap-osd.keyring ceph.client.admin.keyring ceph-deploy-ceph.log
10.查看集群状态：
[root@ centos-01 cluster]# 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 centos-01:/dev/sdb centos-01:/dev/sdc centos-01:/dev/sdd centos-02:/dev/sdb centos-02:/dev/sdc centos-02:/dev/sdd centos-03:/dev/sdb centos-03:/dev/sdc centos-03:/dev/sdd --zap-disk
ceph-deploy --overwrite-conf osd activate centos-01:/dev/sdb1 centos-01:/dev/sdc1 centos-01:/dev/sdd1 centos-02:/dev/sdb1 centos-02:/dev/sdc1 centos-02:/dev/sdd1 centos-03:/dev/sdb1 centos-03:/dev/sdc1 centos-03:/dev/sdd1
集群状态应该如下：
1234567891011 [root@ centos-01 cluster]# 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：
[root@ centos-01 cluster]# ceph osd pool set rbd pg_num 128
set pool 0 pg_num to 128
[root@ centos-01 cluster]# ceph osd pool set rbd pgp_num 128
set pool 0 pgp_num to 128
[root@ centos-01 cluster]# 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
[root@ centos-01 cluster]# 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：
[root@ centos-01 cluster]# ceph-deploy --overwrite-conf config push centos-01 centos-02 centos-03
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
# centos-01为各个monitor所在节点的主机名。
systemctl start ceph-mon@ centos-01.service
systemctl restart ceph-mon@ centos-01.service
systemctl stop ceph-mon@ centos-01.service
#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
[root@ centos-01 cluster]# ceph osd tree
ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 17.94685 root default
-2 5.98228 host ceph-1
0 1.99409 osd.0 up 1.00000 1.00000
1 1.99409 osd.1 up 1.00000 1.00000
8 1.99409 osd.2 up 1.00000 1.00000
-3 5.98228 host ceph-2
2 1.99409 osd.3 up 1.00000 1.00000
3 1.99409 osd.4 up 1.00000 1.00000
4 1.99409 osd.5 up 1.00000 1.00000
-4 5.98228 host ceph-3
5 1.99409 osd.6 up 1.00000 1.00000
6 1.99409 osd.7 up 1.00000 1.00000
7 1.99409 osd.8 up 1.00000 1.00000
来源：oschina
链接：https://my.oschina.net/u/4277043/blog/3555155