CockroachDB Cluster in Docker

1. Pull the mirror

 

docker pull cockroachdb/cockroach:v1.0.2
docker run --rm cockroachdb/cockroach:v1.0.2 version // Confirm that the image is working properly

 2. New bridge

  When running multiple containers in a single-machine environment, you need to use docker's bridge mode to enable mutual access between containers, while ensuring that containers are isolated from each other in the external network environment

 

docker network create -d bridge roachnet

 3. Start the first node

 

 

docker run -d \
--name=roach1 \
--hostname=roach1 \
--net=roachnet \
-p 26257:26257 -p 8080:8080  \
-v "${PWD}/cockroach-data/roach1:/cockroach/cockroach-data"  \
cockroachdb/cockroach:v1.0.2 start --insecure

    -- hostname: Containers join the cluster through hostname

  26257: The default port for cockroach

  8080: port for monitoring UI

 

  -p: map the port of the container host and container

  -v: mount the host directory

  start --insecure start the node inside the container

4. Add another node to the cluster

 

docker run -d \
--name=roach2 \
--hostname=roach2 \
--net=roachnet \
-v "${PWD}/cockroach-data/roach2:/cockroach/cockroach-data" \
cockroachdb/cockroach:v1.0.2 start --insecure --join=roach1

docker run -d \
--name=roach3 \
--hostname=roach3 \
--net=roachnet \
-v "${PWD}/cockroach-data/roach3:/cockroach/cockroach-data" \
cockroachdb/cockroach:v1.0.2 start --insecure --join=roach1

  --join: The container node joins the cluster through the hostname specified earlier

 

5. Cluster test

 

docker exec -it roach1 ./cockroach sql --insecure

 output:

 

# Welcome to the cockroach SQL interface.
# All statements must be terminated by a semicolon.
# To exit: CTRL + D.

 Execute sql:

CREATE DATABASE bank;

CREATE TABLE bank.accounts (id INT PRIMARY KEY, balance DECIMAL);

INSERT INTO bank.accounts VALUES (1, 1000.50);

SELECT * FROM bank.accounts;

 Node 1 result

  +----+---------+
| id | balance |
+----+---------+
|  1 | 1000.50 |
+----+---------+
(1 row)
\q quit

Node 2, Node 3:

SELECT * FROM bank.accounts;

 search result:

+----+---------+
| id | balance |
+----+---------+
|  1 | 1000.50 |
+----+---------+
(1 row)
\q exit node

6. Cluster monitoring

The 8080 port of the host has been managed when the cluster is started, you can view the container

docker ps

 55e09b83cdba        cockroachdb/cockroach:v1.0.2               "/cockroach/cockroach"   40 minutes ago      Up 40 minutes       0.0.0.0:8080->8080/tcp, 0.0.0.0:26257->26257/tcp   roach1

在浏览器中打开地址，http://localhost:8080，本例是在云服务器中执行，所以通过外网查看

 至此已成功docker中运行cockroach集群