之前用的是 ceph-deploy 部署 ceph 集群，在官网的最新介绍中有如下描述：

ceph-deploy is no longer actively maintained. It is not tested on versions of Ceph newer than Nautilus. It does not support RHEL8, CentOS 8, or newer operating systems.

ceph-deploy 已经不在维护，并且在 ceph Nautilus 之后都没有很好的测试，不支持 RHEL8、CentOS8等系统。对比了 ceph-ansible 和 cephadm 这两个工具，最终选择的 ceph-ansible 作为部署工具。

主机角色

Hostname	Role	Admin/Public Network	Cluster Network	OS
node01.ceph.local	ceph-ansible,mon,mgr,osd,rgw,mds,grafana	192.168.198.131/24	172.20.1.131/24	CentOS Linux release 8.3.2011
node02.ceph.local	mon,mgr,osd,rgw,mds	192.168.198.132/24	172.20.1.132/24	CentOS Linux release 8.3.2011
node03.ceph.local	mon,mgr,osd,rgw,mds	192.168.198.133/24	172.20.1.133/24	CentOS Linux release 8.3.2011

前期准备

包括配置IP、配置主机名、配置HOSTS文件、配置加速源（EPEL）、配置时钟同步、关闭 SELinux、关闭Firewalld、设置免密登录等，不再赘述。

Ansible配置

1.ansible安装

使用以下命令安装 ansible, ceph-ansible stable 5.x 需要 ansible 2.9 源中的版本满足需求，可以直接 yum 安装

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# yum install ansible -y

2.主机配置

编辑 /etc/ansible/hosts 加入以下内容

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# vim /etc/ansible/hosts

[mons]
node01.ceph.local
node02.ceph.local
node03.ceph.local

[mgrs]
node01.ceph.local
node02.ceph.local
node03.ceph.local

[osds]
node01.ceph.local
node02.ceph.local
node03.ceph.local

[rgws]
node01.ceph.local
node02.ceph.local
node03.ceph.local

[mdss]
node01.ceph.local
node02.ceph.local
node03.ceph.local

[grafana-server]
node01.ceph.local

ceph-ansible配置

1.下载 ceph-ansible

下载 5.x 版本的 ceph-ansible

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# wget https://github.com/ceph/ceph-ansible/archive/v5.0.3.tar.gz

2.安装 ceph-ansible 依赖

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# tar zxvf v5.0.3.tar.gz
# yum install python-pip
# pip install -r ceph-ansible/requirements.txt

3.修改安装 ceph 配置

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# cd ceph-ansible/group_vars/
# mv all.yml.sample all.yml
# grep -Ev '^#|^$' all.yml
---
dummy:
ceph_repository_type: repository
ceph_origin: repository
ceph_repository: community
ceph_mirror: https://mirrors.tuna.tsinghua.edu.cn/ceph/
ceph_stable_key: https://mirrors.tuna.tsinghua.edu.cn/ceph/keys/release.asc
ceph_stable_release: octopus
ceph_stable_repo: https://mirrors.tuna.tsinghua.edu.cn/ceph/rpm-15.2.7/el7/
monitor_interface: eth0
public_network: 192.168.198.0/24
cluster_network: 172.20.1.0/24
osd_objectstore: bluestore
radosgw_civetweb_port: 8080
radosgw_interface: eth0
dashboard_enabled: True
dashboard_admin_user: admin
dashboard_admin_password: p@ssw0rd
grafana_admin_user: admin
grafana_admin_password: p@ssw0rd
ceph_conf_overrides:
    global:
        mon_allow_pool_delete: true
        mon_osd_allow_primary_affinity: 1
        mon_clock_drift_allowed: 0.5
        osd_pool_default_size: 3
        osd_pool_default_min_size: 1
        mon_pg_warn_min_per_osd: 0
        mon_pg_warn_max_per_osd: 0
        mon_pg_warn_max_object_skew: 0
    client:
        rbd_default_features: 1

4.osd配置

按照服务器配置的磁盘修改以下配置文件

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# cp osds.yml.sample osds.yml
# grep -Ev '^#|^$' osds.yml
---
dummy:
devices:
  - /dev/sdb
  - /dev/sdc

5.其他配置

复制其他的配置文件

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# cp clients.yml.sample clients.yml
# cp mons.yml.sample mons.yml
# cp mgrs.yml.sample mgrs.yml
# cp rgws.yml.sample rgws.yml

# cd ../
# cp site.yml.sample site.yml

开始安装

执行以下命令开始安装

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# ansible-playbook site.yml

完成安装后查看集群状态：

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# ceph -s
  cluster:
    id:     6e344dd2-341a-4bb6-aafa-4299a0ebbe51
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum node01.ceph.local,node02.ceph.local,node03.ceph.local (age 6m)
    mgr: node01.ceph.local(active, since 40s), standbys: node02.ceph.local, node02.ceph.local
    mds: cephfs:1 {0=node01.ceph.local=up:active} 2 up:standby
    osd: 12 osds: 12 up (since 2m), 12 in (since 23m)
    rgw: 3 daemons active (node01.ceph.local.rgw0, node02.ceph.local.rgw0, 3.ceph.local.rgw0)

  data:
    pools:   6 pools, 144 pgs
    objects: 212 objects, 6.4 KiB
    usage:   12 GiB used, 9.8 TiB / 9.8 TiB avail
    pgs:     144 active+clean

清理安装

如果安装出错，或者遇到其他问题，可以清理集群后再次尝试安装

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# ansible-playbook infrastructure-playbooks/purge-cluster.yml