单台物理机ceph集群的搭建

1.添加epel-release拓展源

yum install --nogpgcheck -y epel-release

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7

2.添加ceph源

vi /etc/yum.repos.d/ceph.repo

[Ceph]
name=Ceph packages for $basearch
baseurl=http://mirrors.aliyun.com/ceph/rpm-jewel/el7/$basearch
enabled=1
gpgcheck=1
type=rpm-md
gpgkey=https://mirrors.aliyun.com/ceph/keys/release.asc
priority=1

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

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

3.安装ceph准备

更新主机库文件:yum update -y

下载ceph-deploy:yum install ceph-deploy -y

下载安装ntp服务：yum install ntp ntpdate ntp-doc openssh-server yum-plugin-priorities -y

修改/etc/hosts文件，添加IP-主机名映射，例如：192.168.1.111 node1

创建目录放置ceph安装后的文件并进入目录：mkdir my-cluster ; cd my-cluster

使用ceph-deploy创建新的集群：ceph-deploy new node1（最后为主机名）

修改ceph.conf配置文件，添加一下内容

osd pool default size = 3 #创建3个副本
public_network = 192.168.1.0/24 #公用网络
cluster_network = 192.1681.0/24 #集群网络

4.ceph-deploy下载安装ceph程序：ceph-deploy install node1

5.划分三个大小相等的分区，并且全部大于10GB：例fdisk /dev/sdb

ceph-deploy mon create-initial
ceph-deploy admin node1
chmod +r /etc/ceph/ceph.client.admin.keyring
ceph-disk prepare --cluster node1 --cluster-uuid f453a207-a05c-475b-971d-91ff6c1f6f48 --fs-type xfs /dev/sdb1
剩余的两个分区命令一样，只需要修改/dev/sdb*
上面的uuid使用ceph -s可以查看，就是第一行cluster后面的那串字符，配置文件中可以修改
ceph-disk activate /dev/sdb1
ceph osd getcrushmap -o a.map
crushtool -d a.map -o a
vi a
rule replicated_ruleset {
ruleset 0
type replicated
min_size 1
max_size 10
step take default
step chooseleaf firstn 0 type osd #默认为host，修改为osd
step emit
crushtool -c a -o b.map
ceph osd setcrushmap -i b.map
ceph osd tree
ceph -s