Merge pull request #551 from ofthesun9/doc-swarm
Documentation to deploy mailu on a docker swarm. Fixes #530master
kaiyou
6 years ago
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# Install Mailu on a docker swarm
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## Prequisites
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### Swarm
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In order to deploy Mailu on a swarm, you will first need to initialize the swarm:
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The main command will be:
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```bash
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docker swarm init --advertise-addr <IP_ADDR>
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```
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See https://docs.docker.com/engine/swarm/swarm-tutorial/create-swarm/
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If you want to add other managers or workers, please use:
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```bash
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docker swarm join --token xxxxx
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```
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See https://docs.docker.com/engine/swarm/join-nodes/
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You have now a working swarm, and you can check its status with:
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```bash
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core@coreos-01 ~/git/Mailu/docs/swarm/1.5 $ docker node ls
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ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION
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xhgeekkrlttpmtgmapt5hyxrb black-pearl Ready Active 18.06.0-ce
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sczlqjgfhehsfdjhfhhph1nvb * coreos-01 Ready Active Leader 18.03.1-ce
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mzrm9nbdggsfz4sgq6dhs5i6n flying-dutchman Ready Active 18.06.0-ce
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```
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### Volume definition
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For data persistance (the Mailu services might be launched/relaunched on any of the swarm nodes), we need to have Mailu data stored in a manner accessible by every manager or worker in the swarm.
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Hereafter we will use a NFS share:
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```bash
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core@coreos-01 ~ $ showmount -e 192.168.0.30
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Export list for 192.168.0.30:
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/mnt/Pool1/pv 192.168.0.0
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```
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on the nfs server, I am using the following /etc/exports
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```bash
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$more /etc/exports
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/mnt/Pool1/pv -alldirs -mapall=root -network 192.168.0.0 -mask 255.255.255.0
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```
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on the nfs server, I created the Mailu directory (in fact I copied a working Mailu set-up)
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```bash
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$mkdir /mnt/Pool1/pv/mailu
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```
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On your manager node, mount the nfs share to check that the share is available:
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```bash
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core@coreos-01 ~ $ sudo mount -t nfs 192.168.0.30:/mnt/Pool1/pv/mailu /mnt/local/
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```
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If this is ok, you can umount it:
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```bash
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core@coreos-01 ~ $ sudo umount /mnt/local/
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```
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### Networking mode
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On a swarm, the services are available (default mode) through a routing mesh managed by docker itself. With this mode, each service is given a virtual IP adress and docker manages the routing between this virtual IP and the container(s) provinding this service.
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With this default networking mode, I cannot get login working properly... As found in https://github.com/Mailu/Mailu/issues/375 , a workaround is to use the dnsrr networking mode at least for the front services.
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The main consequence/limitation will be that the front services will *not* be available on every node, but only on the node where it will be deployed. In my case, I have only one manager and I choose to deploy the front service to the manager node, so I know on wich IP the front service will be available (aka the IP adress of my manager node).
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### Variable substitution and docker-compose.yml
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The docker stack deploy command doesn't support variable substitution in the .yml file itself (but we still can use .env file to pass variables to the services). As a consequence we need to adjust the docker-compose file in order to :
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- remove all variables : $VERSION , $BIND_ADDRESS4 , $BIND_ADDRESS6 , $ANTIVIRUS , $WEBMAIL , etc
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- change the way we define the volumes (nfs share in our case)
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- add a deploy section for every service
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### Docker compose
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An example of docker-compose-stack.yml file is available here:
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```yaml
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version: '3.2'
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services:
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front:
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image: mailu/nginx:1.5
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env_file: .env
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ports:
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- target: 80
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published: 80
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mode: host
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- target: 443
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published: 443
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mode: host
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- target: 110
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published: 110
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mode: host
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- target: 143
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published: 143
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mode: host
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- target: 993
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published: 993
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mode: host
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- target: 995
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published: 995
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mode: host
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- target: 25
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published: 25
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mode: host
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- target: 465
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published: 465
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mode: host
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- target: 587
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published: 587
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mode: host
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volumes:
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# - "$ROOT/certs:/certs"
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- type: volume
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source: mailu_certs
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target: /certs
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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redis:
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image: redis:alpine
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restart: always
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volumes:
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# - "$ROOT/redis:/data"
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- type: volume
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source: mailu_redis
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target: /data
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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imap:
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image: mailu/dovecot:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/data:/data"
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- type: volume
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source: mailu_data
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target: /data
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# - "$ROOT/mail:/mail"
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- type: volume
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source: mailu_mail
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target: /mail
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# - "$ROOT/overrides:/overrides"
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- type: volume
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source: mailu_overrides
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target: /overrides
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depends_on:
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- front
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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smtp:
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image: mailu/postfix:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/data:/data"
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- type: volume
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source: mailu_data
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target: /data
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# - "$ROOT/overrides:/overrides"
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- type: volume
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source: mailu_overrides
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target: /overrides
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depends_on:
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- front
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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antispam:
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image: mailu/rspamd:1.5
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restart: always
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env_file: .env
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depends_on:
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- front
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volumes:
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# - "$ROOT/filter:/var/lib/rspamd"
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- type: volume
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source: mailu_filter
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target: /var/lib/rspamd
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# - "$ROOT/dkim:/dkim"
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- type: volume
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source: mailu_dkim
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target: /dkim
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# - "$ROOT/overrides/rspamd:/etc/rspamd/override.d"
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- type: volume
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source: mailu_overrides_rspamd
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target: /etc/rspamd/override.d
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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antivirus:
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image: mailu/none:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/filter:/data"
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- type: volume
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source: mailu_filter
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target: /data
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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webdav:
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image: mailu/none:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/dav:/data"
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- type: volume
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source: mailu_dav
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target: /data
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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admin:
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image: mailu/admin:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/data:/data"
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- type: volume
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source: mailu_data
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target: /data
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# - "$ROOT/dkim:/dkim"
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- type: volume
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source: mailu_dkim
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target: /dkim
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- /var/run/docker.sock:/var/run/docker.sock:ro
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depends_on:
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- redis
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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webmail:
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image: "mailu/roundcube:1.5"
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/webmail:/data"
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- type: volume
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source: mailu_data
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target: /data
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depends_on:
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- imap
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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fetchmail:
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image: mailu/fetchmail:1.5
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restart: always
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env_file: .env
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volumes:
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# - "$ROOT/data:/data"
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- type: volume
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source: mailu_data
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target: /data
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logging:
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driver: none
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deploy:
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endpoint_mode: dnsrr
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replicas: 1
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placement:
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constraints: [node.role == manager]
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volumes:
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mailu_filter:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/filter"
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mailu_dkim:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/dkim"
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mailu_overrides_rspamd:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/overrides/rspamd"
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mailu_data:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/data"
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mailu_mail:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/mail"
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mailu_overrides:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/overrides"
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mailu_dav:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/dav"
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mailu_certs:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/certs"
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mailu_redis:
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driver_opts:
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type: "nfs"
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o: "addr=192.168.0.30,nolock,soft,rw"
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device: ":/mnt/Pool1/pv/mailu/redis"
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```
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### Deploy Mailu on the docker swarm
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Run the following command:
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```bash
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docker stack deploy -c docker-compose-stack.yml mailu
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```
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See how the services are being deployed:
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```bash
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core@coreos-01 ~ $ docker service ls
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ID NAME MODE REPLICAS IMAGE PORTS
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ywnsetmtkb1l mailu_antivirus replicated 1/1 mailu/none:1.5
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pqokiaz0q128 mailu_fetchmail replicated 1/1 mailu/fetchmail:1.5
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```
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check a specific service:
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```bash
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core@coreos-01 ~ $ docker service ps mailu_fetchmail
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ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
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tbu8ppgsdffj mailu_fetchmail.1 mailu/fetchmail:1.5 coreos-01 Running Running 11 days ago
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```
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### Remove the stack
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Run the follwoing command:
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```bash
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core@coreos-01 ~ $ docker stack rm mailu
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```
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