RaspBerry: Instalar Docker Swarm en ClusterHat

Raul Unzue Pulido 1 diciembre, 2021 Automatización, Kubernetes, RaspBerry 1 Comentario 4,009 Vistas

RaspBerry: Instalar Docker Swarm en ClusterHat

Seguimos haciendo entradas alrededor de la placa ClusterHat en la que ya montamos un clúster Kubernetes sobre Raspberry Pi 4 y Pi Zero 2W.

Os recuerdo como es la red del clúster hat:

- RASPBERRY PI 4 (Master): 172.19.181.254
- RASPBERRY PI ZERO 2W (Nodo 1): 172.19.181.1
- RASPBERRY PI ZERO 2W (Nodo 2): 172.19.181.2
- RASPBERRY PI ZERO 2W (Nodo 3): 172.19.181.3
- RASPBERRY PI ZERO 2W (Nodo 4): 172.19.181.4

Con esto…haremos la instalación de nuestro clúster Docker Swarm

Instalar Docker en RaspBerry Pi Zero y RPi 4 Cluster Hat

Lo primero de todo es instalar docker en nuestras 4 x Raspberry Pi Zero 2W y 1 x Pi 4:

curl -sSL https://get.docker.com | sh

1	curl -sSL https://get.docker.com \| sh

A mí me dio un pequeño error:

root@p0:~# curl -sSL https://get.docker.com | sh
# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be
+ sh -c apt-get update -qq >/dev/null
E: Repository 'http://archive.raspberrypi.org/debian buster InRelease' changed its 'Suite' value from 'testing' to 'oldstable'
E: Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'

root@p0:~# curl -sSL https://get.docker.com | sh

# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be

+ sh -c apt-get update -qq >/dev/null

E: Repository 'http://archive.raspberrypi.org/debian buster InRelease' changed its 'Suite' value from 'testing' to 'oldstable'

E: Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable'

Para salir del error utilicé:

root@p0:~# apt-get update --allow-releaseinfo-change

1	root@p0:~# apt-get update --allow-releaseinfo-change

Y el comienzo sigue la siguiente vez:

root@p0:~# curl -sSL https://get.docker.com | sh
# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be
+ sh -c apt-get update -qq >/dev/null
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null
+ sh -c curl -fsSL "https://download.docker.com/linux/raspbian/gpg" | gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg
+ sh -c echo "deb [arch=armhf signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/raspbian buster stable" > /etc/apt/sources.list.d/docker.list
+ sh -c apt-get update -qq >/dev/null
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends  docker-ce-cli docker-ce >/dev/null
+ version_gte 20.10
+ [ -z  ]
+ return 0
+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras >/dev/null
+ sh -c docker version
Client: Docker Engine - Community
 Version:           20.10.11
 API version:       1.41
 Go version:        go1.16.9
 Git commit:        dea9396
 Built:             Thu Nov 18 00:36:42 2021
 OS/Arch:           linux/arm
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.11
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.9
  Git commit:       847da18
  Built:            Thu Nov 18 00:34:59 2021
  OS/Arch:          linux/arm
  Experimental:     false
 containerd:
  Version:          1.4.12
  GitCommit:        7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc:
  Version:          1.0.2
  GitCommit:        v1.0.2-0-g52b36a2
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

================================================================================

To run Docker as a non-privileged user, consider setting up the
Docker daemon in rootless mode for your user:

    dockerd-rootless-setuptool.sh install

Visit https://docs.docker.com/go/rootless/ to learn about rootless mode.


To run the Docker daemon as a fully privileged service, but granting non-root
users access, refer to https://docs.docker.com/go/daemon-access/

WARNING: Access to the remote API on a privileged Docker daemon is equivalent
         to root access on the host. Refer to the 'Docker daemon attack surface'
         documentation for details: https://docs.docker.com/go/attack-surface/

================================================================================

root@p0:~# curl -sSL https://get.docker.com | sh

# Executing docker install script, commit: 93d2499759296ac1f9c510605fef85052a2c32be

+ sh -c apt-get update -qq >/dev/null

+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null

+ sh -c curl -fsSL "https://download.docker.com/linux/raspbian/gpg" | gpg --dearmor --yes -o /usr/share/keyrings/docker-archive-keyring.gpg

+ sh -c echo "deb [arch=armhf signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/raspbian buster stable" > /etc/apt/sources.list.d/docker.list

+ sh -c apt-get update -qq >/dev/null

+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends docker-ce-cli docker-ce >/dev/null

+ version_gte 20.10

+ [ -z ]

+ return 0

+ sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras >/dev/null

+ sh -c docker version

Client: Docker Engine - Community

Version: 20.10.11

API version: 1.41

Go version: go1.16.9

Git commit: dea9396

Built: Thu Nov 18 00:36:42 2021

OS/Arch: linux/arm

Context: default

Experimental: true

Server: Docker Engine - Community

Engine:

Version: 20.10.11

API version: 1.41 (minimum version 1.12)

Go version: go1.16.9

Git commit: 847da18

Built: Thu Nov 18 00:34:59 2021

OS/Arch: linux/arm

Experimental: false

containerd:

Version: 1.4.12

GitCommit: 7b11cfaabd73bb80907dd23182b9347b4245eb5d

runc:

Version: 1.0.2

GitCommit: v1.0.2-0-g52b36a2

docker-init:

Version: 0.19.0

GitCommit: de40ad0

================================================================================

To run Docker as a non-privileged user, consider setting up the

Docker daemon in rootless mode for your user:

dockerd-rootless-setuptool.sh install

Visit https://docs.docker.com/go/rootless/ to learn about rootless mode.

To run the Docker daemon as a fully privileged service, but granting non-root

users access, refer to https://docs.docker.com/go/daemon-access/

WARNING: Access to the remote API on a privileged Docker daemon is equivalent

to root access on the host. Refer to the 'Docker daemon attack surface'

documentation for details: https://docs.docker.com/go/attack-surface/

================================================================================

Hay que repetirlo en todos los nodos del clúster.

Configurar Master Docker Swarm en Raspberry Pi 4 de Cluster Hat

Para completar el master, nuestra raspberry pi 4, lanzamos el siguiente comando:

docker swarm init --advertise-addr 172.19.180.254

1	docker swarm init --advertise-addr 172.19.180.254

Configurar nodos Docker Swarm en Raspberry Pi Zero 2W de Cluster Hat

El comando anterior nos genera un comando que usaremos en cada raspberry pi zero 2w:

root@p0:~# docker swarm init --advertise-addr 172.19.180.254
Swarm initialized: current node (zittfqgksbuh365582pc34y9z) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-5qgdyuadqrfk71asngr6bjy8t8kq29sm3hfimqb3l8qzw6jxmx-6y7730ystgp6h73iajf13zc8b 172.19.180.254:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

root@p0:~# docker swarm init --advertise-addr 172.19.180.254

Swarm initialized: current node (zittfqgksbuh365582pc34y9z) is now a manager.

To add a worker to this swarm, run the following command:

docker swarm join --token SWMTKN-1-5qgdyuadqrfk71asngr6bjy8t8kq29sm3hfimqb3l8qzw6jxmx-6y7730ystgp6h73iajf13zc8b 172.19.180.254:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

Si todo va bien:

root@p1:~# docker swarm join --token SWMTKN-1-5qgdyuadqrfk71asngr6bjy8t8kq29sm3hfimqb3l8qzw6jxmx-6y7730ystgp6h73iajf13zc8b 172.19.180.254:2377
This node joined a swarm as a worker.

1 2	root@p1:~# docker swarm join --token SWMTKN-1-5qgdyuadqrfk71asngr6bjy8t8kq29sm3hfimqb3l8qzw6jxmx-6y7730ystgp6h73iajf13zc8b 172.19.180.254:2377 This node joined a swarm as a worker.

Luego verificáis que el clúster está arriba:

pi@p0:~ $ sudo docker node ls
ID                            HOSTNAME   STATUS    AVAILABILITY   MANAGER STATUS   ENGINE VERSION
zittfqgksbuh365582pc34y9z *   p0         Ready     Active         Leader           20.10.11
cxksjfkdyr96n0u5j9u82gcr1     p1         Ready     Active                          20.10.11
v1ysx37y8yyvcya1c9yaer6x9     p2         Ready     Active                          20.10.11
tfb79sopkpdagx2s8867s58gj     p3         Ready     Active                          20.10.11
zsb4bg5oih6h2ah5ve1z6huor     p4         Ready     Active                          20.10.11

pi@p0:~ $ sudo docker node ls

ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS ENGINE VERSION

zittfqgksbuh365582pc34y9z * p0 Ready Active Leader 20.10.11

cxksjfkdyr96n0u5j9u82gcr1 p1 Ready Active 20.10.11

v1ysx37y8yyvcya1c9yaer6x9 p2 Ready Active 20.10.11

tfb79sopkpdagx2s8867s58gj p3 Ready Active 20.10.11

zsb4bg5oih6h2ah5ve1z6huor p4 Ready Active 20.10.11

Aseguraros que el servicio docker levantará al reiniciar:

pi@p0:~ $ sudo systemctl enable docker
Synchronizing state of docker.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable docker

pi@p0:~ $ sudo systemctl enable docker

Synchronizing state of docker.service with SysV service script with /lib/systemd/systemd-sysv-install.

Executing: /lib/systemd/systemd-sysv-install enable docker

Crear docker visualizer en ClusterHat

Ahora creamos un contenedor, por ejemplo, docker visualizer:

sudo docker service create \
    --name viz \
    --publish 8080:8080/tcp \
    --constraint node.role==manager \
    --mount type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
    alexellis2/visualizer-arm:latest