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+# Ceph Installation
+
+---
+## Intro
+Ceph is used to build a storage system accross all machines
+
+## Architecture
+We consider the following architecture
+
+    TODO: add schema (4 machines: ceph-admin, 3 ceph-nodes: opensteak9{2,3,4})
+
+Networks:
+```
+192.168.0.0/24 is the cluster network (use for storage)
+192.168.1.0/24 is the management network (use for admin task)
+```
+
+
+## Ceph-admin machine preparation
+
+This is done on an Ubuntu 14.04 64b server
+
+### Install ceph-deploy
+```bash
+wget -q -O- 'https://ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/release.asc' | sudo apt-key add -
+echo deb http://ceph.com/debian-firefly/ $(lsb_release -sc) main | sudo tee /etc/apt/sources.list.d/ceph.list
+sudo apt-get update && sudo apt-get install ceph-deploy
+```
+
+### Install ntp
+```bash
+sudo apt-get install ntp
+sudo service ntp restart
+```
+
+### Create a ceph user on each node (ceph-admin included)
+```bash
+sudo useradd -d /home/ceph -m ceph
+sudo passwd ceph
+```
+
+Add sudo rights:
+```bash
+echo "ceph ALL = (root) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/ceph
+sudo chmod 0440 /etc/sudoers.d/ceph
+```
+
+* *Note: if you think this can be a security treat, remove the ceph user from sudoers after installation is complete*
+
+* *Note 2: the ceph documentation ask for this user: http://ceph.com/docs/master/rados/deployment/preflight-checklist/?highlight=sudoers*
+
+
+### Add each node in hosts file (ceph-admin included)
+```bash
+sudo bash -c ' cat << EOF >> /etc/hosts
+192.168.1.200 ceph-admin
+192.168.1.92 opensteak92
+192.168.1.93 opensteak93
+192.168.1.94 opensteak94
+EOF'
+```
+
+### Create and copy a passwordless ssh key to each node
+```bash
+ssh-keygen
+ssh-copy-id ceph@ceph-admin
+ssh-copy-id ceph@opensteak92
+ssh-copy-id ceph@opensteak93
+ssh-copy-id ceph@opensteak94
+```
+
+### Create a .ssh/config file to connect automatically
+```bash
+cat << EOF >> .ssh/config
+Host ceph-admin
+  Hostname ceph-admin
+  User ceph
+Host opensteak92
+  Hostname opensteak92
+  User ceph
+Host opensteak93
+  Hostname opensteak93
+  User ceph
+Host opensteak94
+  Hostname opensteak94
+  User ceph
+EOF
+```
+
+## Ceph storage cluster
+All these commands must be run inside the ceph-admin machine as a regular user
+
+### Prepare folder
+```bash
+mkdir ceph-cluster
+cd ceph-cluster/
+```
+
+### Deploy initial monitor on first node
+```bash
+ceph-deploy new opensteak92
+```
+
+### Configure ceph
+We set default pool size to 2 and public/cluster networks:
+
+```bash
+cat << EOF >> ceph.conf
+osd pool default size = 2
+public network = 192.168.1.0/24
+cluster network = 192.168.0.0/24
+EOF
+```
+
+### Install ceph in all nodes
+```bash
+ceph-deploy --username ceph install ceph-admin opensteak92 opensteak93 opensteak94
+```
+
+### Create initial monitor and gather the keys
+```bash
+ceph-deploy --username ceph mon create-initial
+```
+
+### Create and add OSD
+We will use hard disk (/dev/sdb) for storage: http://docs.ceph.com/docs/master/rados/deployment/ceph-deploy-osd/
+
+```bash
+ceph-deploy --username ceph osd create opensteak93:sdb
+ceph-deploy --username ceph osd create opensteak94:sdb
+```
+
+### Prepare all nodes to administer the cluster
+Prepare all nodes with a ceph.conf and ceph.client.admin.keyring keyring so that it can administer the cluster:
+
+```bash
+ceph-deploy admin ceph-admin opensteak92 opensteak93 opensteak94
+sudo chmod +r /etc/ceph/ceph.client.admin.keyring
+```
+
+### Add a metadata server in first node
+```bash
+ceph-deploy--username ceph mds create opensteak92
+```
+
+## Extend
+### Extend the OSD pool
+We decided to extend OSD pool by adding the first node as well:
+
+```bash
+ceph-deploy --username ceph osd create opensteak92:sdb
+```
+
+### Extend the monitors
+In the same spirit, extend the monitor by adding the two last nodes and check the status
+```bash
+ceph-deploy --username ceph mon create opensteak93 opensteak94
+ceph quorum_status --format json-pretty
+```
+
+## Check status
+```bash
+ceph health
+```
+
+## Create a file system
+Check osd pools:
+```bash
+ceph osd lspools
+```
+
+I you don't have data and metadata pools, create it:
+```bash
+ceph osd pool create cephfs_data 64
+ceph osd pool create cephfs_metadata 64
+```
+
+Then enable filesystem on the cephfs_data pool:
+```bash
+ceph fs new cephfs cephfs_metadata cephfs_data
+```
+
+And check again:
+```bash
+ceph osd lspools
+```
+
+Should produce:
+```bash
+0 rbd,1 cephfs_data,2 cephfs_metadata,
+```
+
+You can check as well with:
+```bash
+$ ceph fs ls
+name: cephfs, metadata pool: cephfs_metadata, data pools: [cephfs_data ]
+
+$ ceph mds stat
+e5: 1/1/1 up {0=opensteak92=up:active}
+```
+
+## Mount file system
+For each node you want to mount ceph in **/mnt/cephfs/**, run:
+```bash
+ssh opensteak9x "cat /etc/ceph/ceph.client.admin.keyring |grep key|awk '{print \$3}'|sudo tee /etc/ceph/ceph.client.admin.key"
+
+ssh opensteak9x "sudo mkdir /mnt/cephfs"
+
+ssh opensteak9x "echo '192.168.1.92:6789:/ /mnt/cephfs ceph name=admin,secretfile=/etc/ceph/ceph.client.admin.key,noatime 0 2' | sudo tee --append /etc/fstab && sudo mount /mnt/cephfs"
+```
+
+This will add a line in fstab so the file system will automatically be mounted on boot.
+
+## TODO
+
+* create a python/bash script that will install & check that the cluster is well configured (do all of this automatically)
+* create a conf file that will be used by the above script to describe the architecture?