ceph集群安装

所有 Ceph 部署都始于 Ceph 存储集群。一个 Ceph 集群可以包含数千个存储节点，最简系统至少需要一个监视器和两个 OSD 才能做到数据复制。Ceph 文件系统、 Ceph 对象存储、和 Ceph 块设备从 Ceph 存储集群读出和写入数据。

Ceph架构图

1、集群配置

节点	IP	功能
ceph01	172.16.100.5	deploy,mon,osd*2,mds
ceph02	172.16.100.6	mon,osd*2
ceph03	172.16.100.7	mon,osd*2

2、系统版本

#cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)

3、三个节点分别额外挂载两块20G磁盘

#lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0      2:0    1    4K  0 disk
sda      8:0    0   20G  0 disk
├─sda1   8:1    0  476M  0 part /boot
└─sda2   8:2    0 19.5G  0 part /
sdb      8:16   0   20G  0 disk
sdc      8:32   0   23G  0 disk
sr0     11:0    1 1024M  0 rom 

4、关闭防火墙

#vim /etc/selinux/config
disabled
#setenforce 0

#systemctl stop firewalld
#systemctl disable firewalld

5、添加hosts

#vim /etc/hosts
172.16.100.5     ceph01
172.16.100.6     ceph02
172.16.100.7     ceph03

6、配置SSH免密登陆

#ssh-keygen
#ssh-copy-id ceph01
#ssh-copy-id ceph02
#ssh-copy-id ceph03

7、校对时间

#yum install -y ntp ntpdate
#ntpdate pool.ntp.org

8、添加yum源

#vim /etc/yum.repos.d/ceph.repo
[ceph]
name=Ceph packages for $basearch
baseurl=http://download.ceph.com/rpm-jewel/el7/$basearch
enabled=1
priority=2
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[ceph-noarch]
name=Ceph noarch packages
baseurl=http://download.ceph.com/rpm-jewel/el7/noarch
enabled=1
priority=2
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

[ceph-source]
name=Ceph source packages
baseurl=http://download.ceph.com/rpm-jewel/el7/SRPMS
enabled=0
priority=2
gpgcheck=1
type=rpm-md
gpgkey=https://download.ceph.com/keys/release.asc

8、导入密钥

#rpm --import 'https://download.ceph.com/keys/release.asc'

9、安装ceph客户端

#yum install -y ceph ceph-radosgw rdate

10、安装 ceph-deploy

#yum update -y
#yum install -y ceph-deploy

11、创建集群

#mkdir -pv /opt/cluster
#cd /opt/cluster
#ceph-deploy new ceph01 ceph02 ceph03
#ls
ceph.conf  ceph-deploy-ceph.log  ceph.mon.keyring

12、修改配置文件，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）

#vim ceph.conf
[global]
fsid = 79aa9d8d-65e4-4a9d-84c4-50dbd3db337e
mon_initial_members = ceph01, ceph02
mon_host = 192.168.135.163,192.168.135.164
auth_cluster_required = cephx
auth_service_required = cephx
auth_client_required = cephx
public_network = 172.16.100.0/24
mon_clock_drift_allowed = 2

13、部署MON

#ceph-deploy mon create-initial
#ceph -s
cluster 6fb69a7a-647a-4cb6-89ad-583729eb0406
health HEALTH_ERR
    no osds
monmap e1: 3 mons at {ceph01=172.16.100.5:6789/0,ceph02=172.16.100.6:6789/0,ceph03=172.16.100.7:6789/0}
    election epoch 8, quorum 0,1,2 ceph01,ceph02,ceph03
osdmap e1: 0 osds: 0 up, 0 in
    flags sortbitwise,require_jewel_osds
pgmap v2: 64 pgs, 1 pools, 0 bytes data, 0 objects
    0 kB used, 0 kB / 0 kB avail
          64 creating

14、部署OSD

#ceph-deploy disk zap ceph01:sdb ceph01:sdc
#ceph-deploy disk zap ceph02:sdb ceph02:sdc
#ceph-deploy disk zap ceph03:sdb ceph03:sdc
#ceph-deploy osd prepare ceph01:sdb:sdc
#ceph-deploy osd prepare ceph02:sdb:sdc
#ceph-deploy osd prepare ceph03:sdb:sdc
#ceph-deploy osd activate ceph01:sdb1:sdc1
#ceph-deploy osd activate ceph02:sdb1:sdc1
#ceph-deploy osd activate ceph03:sdb1:sdc1
#lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
fd0      2:0    1    4K  0 disk
sda      8:0    0   20G  0 disk
├─sda1   8:1    0  476M  0 part /boot
└─sda2   8:2    0 19.5G  0 part /
sdb      8:16   0   20G  0 disk
└─sdb1   8:17   0   20G  0 part /var/lib/ceph/osd/ceph-0
sdc      8:32   0   23G  0 disk
└─sdc1   8:33   0    5G  0 part
sr0     11:0    1 1024M  0 rom

15、再次查看集群状态，如果是active+clean状态就是正常的。

#ceph -s
cluster 6fb69a7a-647a-4cb6-89ad-583729eb0406
health HEALTH_OK
monmap e1: 3 mons at {ceph01=172.16.100.5:6789/0,ceph02=172.16.100.6:6789/0,ceph03=172.16.100.7:6789/0}
    election epoch 8, quorum 0,1,2 ceph01,ceph02,ceph03
osdmap e15: 3 osds: 3 up, 3 in
    flags sortbitwise,require_jewel_osds
pgmap v32: 64 pgs, 1 pools, 0 bytes data, 0 objects
    101 MB used, 61305 MB / 61406 MB avail
          64 active+clean