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选题[tech]: 20210111 Deploy Ceph in a Raspberry Pi cluster
sources/tech/20210111 Deploy Ceph in a Raspberry Pi cluster.md
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sources/tech/20210111 Deploy Ceph in a Raspberry Pi cluster.md
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sources/tech/20210111 Deploy Ceph in a Raspberry Pi cluster.md
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[#]: collector: (lujun9972)
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[#]: translator: ( )
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (Deploy Ceph in a Raspberry Pi cluster)
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[#]: via: (https://opensource.com/article/21/1/ceph-raspberry-pi)
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[#]: author: (AJ Canlas https://opensource.com/users/ajscanlas)
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Deploy Ceph in a Raspberry Pi cluster
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======
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Install Ceph storage using ceph-ansible and deploy it in a Raspberry Pi
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cluster.
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![Vector, generic Raspberry Pi board][1]
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[Ceph][2] is an open source software storage platform that provides object, block, and filesystem storage in a unified storage cluster. I first used Ceph when I [integrat][3][ed it with OpenStack][3]. At first, I was confused about why I should use Ceph since storage devices are widely available. But after using it for more than three years, the platform's stability and integrity have proven its value again and again.
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This article will show you how to install Ceph using [ceph-ansible][4] (an officially supported Ansible playbook for Ceph) and deploy it in a Raspberry Pi cluster.
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**Materials:**
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1. Four Raspberry Pi 4B 4GB models
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2. Four 32GB microSD cards (boot OS)
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3. Four Raspberry Pi cases with fans and heatsinks (very important)
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4. Four Raspberry Pi chargers
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5. Six 32GB USB flash drives (for the Ceph OSD nodes)
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**Architecture:**
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![Project architecture][5]
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(Aaron John Canlas, [CC BY-SA 4.0][6])
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Regarding the configuration:
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* Both the front-end and back-end networks are in the same subnet
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* The [Ceph Monitor][7] software uses a Raspberry Pi 4B with 4GB RAM
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* The [Ceph OSD][8] nodes use the same Raspberry Pi model but with two USB flash drives for the OSD disks
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### Deploy Ceph using ceph-ansible
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Using Ceph's Ansible repository makes the deployment smooth and simple.
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#### 1\. Copy ssh keys to all servers
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I have a common user called `cephadmin` on all servers (each Raspberry Pi is a server in this context). The `cephadmin` user is configured with passwordless `sudo` to make things easier.
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After generating a key using `ssh-keygen`, deploy all keys using `ssh-copy-id`.
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I use a Bash for-loop because I'm using consistent and incremental hostnames:
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```
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$ for i in {0..3}; \
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do ssh-copy-id cephadmin@rpi4b4-$i; \
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done
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```
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You need to accept and enter your password on each one, but you can automate this with `expect`.
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#### 2\. Clone ceph-ansible and install requirements
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Install Git to clone the repository:
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```
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`$ sudo yum install git -y`
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```
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Clone the ceph-ansible repository:
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```
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$ git clone <https://github.com/ceph/ceph-ansible.git>
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$ cd ceph-ansible/
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```
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I'm using an AArch64 build of CentOS 7, so I must install some required packages before continuing.
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First, Python pip:
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```
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`$ sudo yum install python3-pip -y`
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```
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Then the packages ceph-ansible needs:
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```
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`$ sudo yum install python3-devel libffi-devel openssl-devel -y`
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```
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Finally, the requirements `ceph-ansible` needs:
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```
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`$ pip3 install -r requirements.txt --user`
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```
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I received this error:
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```
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You are linking against OpenSSL 1.0.2, which is no longer supported by the OpenSSL project.
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To use this version of cryptography you need to upgrade to a newer version of OpenSSL. For
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this version only you can also set the environment variable
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CRYPTOGRAPHY_ALLOW_OPENSSL_102 to allow OpenSSL 1.0.2.
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```
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This may be related to the architecture, because I can't replicate the error in a CentOS 7 virtual machine.
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For deployment, export `CRYPTOGRAPHY_ALLOW_OPENSSL_102` to `True` so that Ansible can run:
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```
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`$ export CRYPTOGRAPHY_ALLOW_OPENSSL_102=True`
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```
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#### 3\. Configure ceph-ansible for deployment
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Now you're ready to deploy Ceph using ceph-ansible.
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Copy `site.yml.sample` to `site.yml`:
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```
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`$ mv site.yml.sample site.yml`
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```
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Create `all.yml` in the `group_vars` directory:
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```
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$ cat << EOF >> group_vars/all.yml
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ceph_origin: repository
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ceph_repository: community
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ceph_repository_type: cdn
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ceph_stable_release: nautilus
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monitor_interface: wlan0
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public_network: "192.168.100.0/24"
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cluster_network: "192.168.100.0/24"
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dashboard_enabled: false
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configure_firewall: false
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EOF
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```
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Create `osds.yml` in the `group_vars` directory:
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```
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$ cat << EOF >> group_vars/all.yml
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osd_scenario: collocated
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devices:
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- /dev/sda
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\- /dev/sdb
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EOF
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```
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Create an inventory file:
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```
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$ cat << EOF >> inventory
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[mons]
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rpi4b4-0
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[osds]
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rpi4b4-1
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rpi4b4-2
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rpi4b4-3
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EOF
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```
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As of this writing, there is a bug in the ceph-ansible repository (according to this [bug ticket][9]). You can mitigate the bug by editing line 85 and 86 of the roles:
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```
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- (wait_for_all_osds_up.stdout | from_json)["osdmap"]["num_osds"] | int > 0
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- (wait_for_all_osds_up.stdout | from_json)["osdmap"]["num_osds"] == (wait_for_all_osds_up.stdout | from_json)["osdmap"]["num_up_osds"]
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```
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#### 4\. Deploy Ceph
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Run the Ansible playbook with your inventory file:
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```
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`$ ansible-playbook -i inventory site.yml`
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```
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After 15–20 minutes, you should see this result:
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![Ceph deployment][10]
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(Aaron John Canlas, [CC BY-SA 4.0][6])
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### Next steps
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Previously, I [manually deployed][11] an OpenStack cluster in another Raspberry Pi cluster. I hope to integrate it with this one. I'm also looking into deploying with [TripleO][12].
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The possibilities for Raspberry Pi, Ansible, and OpenStack are endless. Get started with your own experiment, and let me know how it goes in the comments.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/1/ceph-raspberry-pi
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作者：[AJ Canlas][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/ajscanlas
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/raspberrypi_board_vector_red.png?itok=yaqYjYqI (Vector, generic Raspberry Pi board)
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[2]: https://ceph.io/
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[3]: https://opensource.com/business/15/1/introduction-ceph-storage-openstack
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[4]: https://docs.ceph.com/projects/ceph-ansible/en/latest/index.html#
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[5]: https://opensource.com/sites/default/files/uploads/architecture_0_0.png (Project architecture)
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[6]: https://creativecommons.org/licenses/by-sa/4.0/
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[7]: https://docs.ceph.com/en/latest/glossary/#term-Ceph-Monitor
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[8]: https://docs.ceph.com/en/latest/glossary/#term-OSD
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[9]: https://tracker.ceph.com/issues/43430
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[10]: https://opensource.com/sites/default/files/uploads/ceph.png (Ceph deployment)
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[11]: https://opensource.com/article/20/12/openstack-raspberry-pi
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[12]: https://wiki.openstack.org/wiki/TripleO
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