通过docker部署consul集群。最新版本：1.8.3
官方Dockerfile：https://github.com/hashicorp/docker-consul/blob/master/0.X/Dockerfile
FROM alpine:3.12
LABEL org.opencontainers.image.authors="Consul Team"
ENV CONSUL_VERSION=1.8.3
ENV HASHICORP_RELEASES=https://releases.hashicorp.com
RUN addgroup consul && \
adduser -S -G consul consul
RUN set -eux && \
apk add --no-cache ca-certificates curl dumb-init gnupg libcap openssl su-exec iputils jq libc6-compat && \
gpg --keyserver pgp.mit.edu --recv-keys 91A6E7F85D05C65630BEF18951852D87348FFC4C && \
mkdir -p /tmp/build && \
cd /tmp/build && \
apkArch="$(apk --print-arch)" && \
case "${apkArch}" in \
aarch64) consulArch='arm64' ;; \
armhf) consulArch='armhfv6' ;; \
x86) consulArch='386' ;; \
x86_64) consulArch='amd64' ;; \
*) echo >&2 "error: unsupported architecture: ${apkArch} (see ${HASHICORP_RELEASES}/consul/${CONSUL_VERSION}/)" && exit 1 ;; \
esac && \
wget ${HASHICORP_RELEASES}/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_${consulArch}.zip && \
wget ${HASHICORP_RELEASES}/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_SHA256SUMS && \
wget ${HASHICORP_RELEASES}/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_SHA256SUMS.sig && \
gpg --batch --verify consul_${CONSUL_VERSION}_SHA256SUMS.sig consul_${CONSUL_VERSION}_SHA256SUMS && \
grep consul_${CONSUL_VERSION}_linux_${consulArch}.zip consul_${CONSUL_VERSION}_SHA256SUMS | sha256sum -c && \
unzip -d /bin consul_${CONSUL_VERSION}_linux_${consulArch}.zip && \
cd /tmp && \
rm -rf /tmp/build && \
gpgconf --kill all && \
apk del gnupg openssl && \
rm -rf /root/.gnupg && \
consul version
RUN mkdir -p /consul/data && \
mkdir -p /consul/config && \
chown -R consul:consul /consul
RUN test -e /etc/nsswitch.conf || echo 'hosts: files dns' > /etc/nsswitch.conf
VOLUME /consul/data
EXPOSE 8300
EXPOSE 8301 8301/udp 8302 8302/udp
EXPOSE 8500 8600 8600/udp
COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
ENTRYPOINT ["docker-entrypoint.sh"]
CMD ["agent", "-dev", "-client", "0.0.0.0"]
consul容器启动时，agent将从 /consul/config 中读取配置JSON文件，数据将保留在 /consul/data 中，可以此进行存储持久化。
这里启动4个Consul Agent。其中3个Server（选举出一个leader），1个Client。
- 主机说明：
| 系统 | ip | 角色 |
|---|---|---|
| CentOS 7.8 | 192.168.30.128 | Server |
| CentOS 7.8 | 192.168.30.129 | Server |
| CentOS 7.8 | 192.168.30.130 | Server |
| CentOS 7.8 | 192.168.30.131 | Client |
- 拉取镜像：
所有节点拉取镜像，
mkdir -p /consul/{config,data}docker pull consul
- 集群部署：
第一个server启动，
docker run -d --name=consul-server1 --net=host -e CONSUL_BIND_INTERFACE=ens33 -v /consul/config:/consul/config -v /consul/data:/consul/data consul:latest agent -server -node=agent128 -bootstrap-expect=3 -client=0.0.0.0 -ui
docker exec consul-server1 consul members Node Address Status Type Build Protocol DC Segment agent128 192.168.30.128:8301 alive server 1.8.3 2 dc1 <all>
剩下两个Server启动并加入集群，
docker run -d --name=consul-server2 --net=host -e CONSUL_BIND_INTERFACE=ens33 consul agent -server -node=agent129 -client=0.0.0.0 -join 192.168.30.128 docker run -d --name=consul-server3 --net=host -e CONSUL_BIND_INTERFACE=ens33 consul agent -server -node=agent130 -client=0.0.0.0 -join 192.168.30.128
Client启动并加入集群，
docker run -d --name=consul-client1 --net=host -e CONSUL_BIND_INTERFACE=ens33 consul agent -node=agent131 -client=0.0.0.0 -join 192.168.30.128
- 查看集群：
docker exec consul-server1 consul members Node Address Status Type Build Protocol DC Segment agent128 192.168.30.128:8301 alive server 1.8.3 2 dc1 <all>agent129 192.168.30.129:8301 alive server 1.8.3 2 dc1 <all>agent130 192.168.30.130:8301 alive server 1.8.3 2 dc1 <all>agent131 192.168.30.131:8301 alive client 1.8.3 2 dc1 <default>
- 访问ui：
访问192.168.30.128:8500/ui，
consul集群部署完成。