nomad cluster 起動

README.md

Nomad Rocky Linux 9 Cluster (3 nodes)

This setup creates three Rocky Linux 9 containers running HashiCorp Nomad in server mode, forming a cluster.

Prerequisites

• Docker and Docker Compose

Run

# Build images and start the cluster
docker compose up -d --build

# View cluster members
docker exec -it nomad1 nomad server members

# Open Nomad UI (if exposed): http://localhost:4646

Stop and cleanup

docker compose down -v

DIRECTIONS.md

docker compose file を作る rockylinux9 のインスタンスを 3 つ hashicorp nomad をインストールしてクラスタ化する

docker-compose.yml

version: "3.8"

services:
  nomad1:
    build:
      context: .
      dockerfile: Dockerfile.nomad
    hostname: nomad1
    container_name: nomad1
    command:
      - -retry-join=nomad2
      - -retry-join=nomad3
    environment:
      - NOMAD_NODE_NAME=nomad1
      - NOMAD_SERVER=true
      - NOMAD_BOOTSTRAP_EXPECT=3
    networks:
      nomadnet:
    ports:
      - "4646:4646"  # Nomad UI/API
    volumes:
      - nomad1_data:/var/lib/nomad

  nomad2:
    build:
      context: .
      dockerfile: Dockerfile.nomad
    hostname: nomad2
    container_name: nomad2
    command:
      - -retry-join=nomad1
      - -retry-join=nomad3
    environment:
      - NOMAD_NODE_NAME=nomad2
      - NOMAD_SERVER=true
      - NOMAD_BOOTSTRAP_EXPECT=3
    networks:
      nomadnet:
    volumes:
      - nomad2_data:/var/lib/nomad

  nomad3:
    build:
      context: .
      dockerfile: Dockerfile.nomad
    hostname: nomad3
    container_name: nomad3
    command:
      - -retry-join=nomad2
      - -retry-join=nomad1
    environment:
      - NOMAD_NODE_NAME=nomad3
      - NOMAD_SERVER=true
      - NOMAD_BOOTSTRAP_EXPECT=3
    networks:
      nomadnet:
    volumes:
      - nomad3_data:/var/lib/nomad

networks:
  nomadnet:
    driver: bridge

volumes:
  nomad1_data:
  nomad2_data:
  nomad3_data:

Dockerfile.nomad

# Rocky Linux 9 base with Nomad installed
FROM rockylinux:9

ARG NOMAD_VERSION=1.8.2

RUN dnf -y update
RUN dnf -y install wget unzip shadow-utils tar
RUN useradd -r -u 998 -g root -s /sbin/nologin nomad
RUN mkdir -p /opt/nomad /etc/nomad.d /var/lib/nomad
RUN cd /tmp && wget -q https://releases.hashicorp.com/nomad/${NOMAD_VERSION}/nomad_${NOMAD_VERSION}_linux_amd64.zip
RUN cd /tmp && unzip nomad_${NOMAD_VERSION}_linux_amd64.zip
RUN mv /tmp/nomad /usr/local/bin/nomad
RUN chmod +x /usr/local/bin/nomad
RUN rm -rf /tmp/*
RUN dnf -y clean all

COPY entrypoint.sh /usr/local/bin/entrypoint.sh
RUN chmod +x /usr/local/bin/entrypoint.sh && \
    chown -R nomad:root /etc/nomad.d /var/lib/nomad

EXPOSE 4646 4647 4648
VOLUME ["/var/lib/nomad"]

ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

# Defaults from environment
NODE_NAME="${NOMAD_NODE_NAME:-$(hostname)}"
IS_SERVER="${NOMAD_SERVER:-true}"
BOOTSTRAP_EXPECT="${NOMAD_BOOTSTRAP_EXPECT:-3}"
DATA_DIR="/var/lib/nomad"
CONFIG_DIR="/etc/nomad.d"

mkdir -p "$DATA_DIR" "$CONFIG_DIR"

IP_ADDR=$(hostname -i | awk '{print $1}')

cat > "$CONFIG_DIR/server.hcl" <<EOF
data_dir = "$DATA_DIR"
bind_addr = "0.0.0.0"
name = "$NODE_NAME"
log_level = "INFO"
advertise {
  http = "$IP_ADDR:4646"
  rpc  = "$IP_ADDR:4647"
  serf = "$IP_ADDR:4648"
}
server {
  enabled = ${IS_SERVER}
  bootstrap_expect = ${BOOTSTRAP_EXPECT}
}
EOF

# Start Nomad agent
exec /usr/local/bin/nomad agent \
  -config="$CONFIG_DIR/server.hcl" "$@"