ha-docker-cluster-with-swarm-and-ceph

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> # ARCHIVED: Don't use Swarm, use Kubernetes

# HA Docker Cluster with Swarm and Ceph

2020 Ondrej Sika <ondrej@ondrejsika.com>
    https://github.com/ondrejsika/ha-docker-cluster-with-swarm-and-ceph

## HW Requirements

- 3 nodes
- 2 hdd (one for system, one for ceph)

## Software Requirements

- Debian 10
- Docker
- Ceph (Nautilus)
- Ceph Deploy

## Install Docker

On all 3 nodes install Docker

```
curl -fsSL https://ins.oxs.cz/docker.sh | sudo sh
```

## Install Ceph Nautulus on Debian 10

Ceph does'n have official repositories for Debian 10 Buster yet (29-01-2020), we use [Croit](https://croit.io) mirror. See their blog post <https://croit.io/2019/07/07/2019-07-07-debian-mirror>

```
# Add repositories
curl https://mirror.croit.io/keys/release.gpg > /etc/apt/trusted.gpg.d/croit-mirror.gpg
echo 'deb [signed-by=/etc/apt/trusted.gpg.d/croit-mirror.gpg] https://mirror.croit.io/debian-nautilus/ buster main' > /etc/apt/sources.list.d/croit-ceph.list
printf 'Package: *\nPin: origin mirror.croit.io\nPin-Priority: 990\n' > /etc/apt/preferences.d/pin-mirror-croit-io
apt update

# Check Apt Pin
apt-cache policy ceph

# Install CEPH
apt install -y ceph

# Install NTP
apt install -y ntpsec
```

## Install Ceph Deploy

Install ceph-deploy on first node

```
# Ensure Python 3
apt install -y python3 python3-pip

# Install Ceph Deploy
pip3 install ceph-deploy
```

## Setup hostnames

Set fqdn hostname `node{1,2,3}.sikademo.com` to every node (in `/etc/hostname`).

## Setup /etc/hosts

Add those lines to `/etc/hosts` in every node

```
192.168.0.11 node1 node1.sikademo.com
192.168.0.12 node2 node2.sikademo.com
192.168.0.13 node3 node3.sikademo.com
```

## Setup Ceph Cluster

See more: <https://docs.ceph.com/docs/master/start/quick-ceph-deploy>

Create directory `ceph-deploy` and checkout there.

```
mkdir ~/ceph-deploy
cd ~/ceph-deploy
```

```
ceph-deploy new node1 node2 node3
```

Add Ceph network to `ceph.conf`

```
echo public network = 192.168.0.0/24 >> ceph.conf
```

If you follow tutorial on Ceph, skip ceph-deploy install - we have ceph already installed and ceph-deploy install does't work on Debian 10 yet (29-01-2020).

Setup monitors

```
ceph-deploy mon create-initial
```

Setup admin nodes (you can manage ceph on those nodes)

```
ceph-deploy admin node1 node2 node3
```

Create OSDs

```
ceph-deploy osd create --data /dev/sdb node1
ceph-deploy osd create --data /dev/sdb node2
ceph-deploy osd create --data /dev/sdb node3
```

Check Ceph health

```
ceph health
```

Check Ceph status

```
ceph -s
```

## Setup CephFS

See more: <https://docs.ceph.com/docs/master/start/quick-cephfs/>

Create metadata servers on each node

```
ceph-deploy mds create node1 node2 node3
```

Create Filesystem

```
ceph osd pool create cephfs_data 32
ceph osd pool create cephfs_meta 32
ceph fs new cephfs cephfs_meta cephfs_data
```

Mount CephFS

```
mount -t ceph :/ /cephfs -o name=admin
```

## Setup Swarm

Init Swarm on first node

```
docker swarm init
```

Generate join token for manager

```
docker swarm join-token manager
```

Call `docker swarm join ...` with master token on other nodes.

## Setup Traefik

Clone traefik-le repo

```
cd ~
git clone https://github.com/ondrejsika/traefik-le.git
cd traefik-le
```

### HTTP only

If you have SSL termination before this cluster, you can use http only configuration of Traefik.

Run Traefik HTTP only

```
docker stack deploy -c docker-compose-swarm-http.yml traefik
```

### HTTPS using Let's Encrypt

If you don't have proxy or dont want to terminate ssl on proxy, you can setup Traefik with SSL and automatic genetation of SSL certificates using Let's Encrypt.

Run Traefik with Let's Encrypt

```
docker stack deploy -c docker-compose-swarm.yml traefik
```

## Deploy Example Project

Now, you can deploy demo site (from traefik-le examples). You have pointed DNS `*.swarm.sikademo.com` to this cluster.

```
# Go Hello World Example
HOST=hello.swarm.sikademo.com docker stack deploy -c demo-sites/hello-world/docker-compose.yml hello

# Nginx Example
HOST=nginx.swarm.sikademo.com docker stack deploy -c demo-sites/nginx/docker-compose.yml nginx
```

Check out <http://hello.swarm.sikademo.com> and <http://nginx.swarm.sikademo.com>.

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