Once you've installed the official CockroachDB Docker image, it's simple to run an insecure multi-node cluster across multiple Docker containers on a single host, using Docker volumes to persist node data.
To try CockroachDB Cloud instead of running CockroachDB yourself, refer to the Cloud Quickstart.
The --insecure
flag used in this tutorial is intended for non-production testing only. To run CockroachDB in production, use a secure cluster instead.
Before you begin
- Make sure you have already installed the official CockroachDB Docker image.
- For quick SQL testing or app development, consider running a single-node cluster instead.
- Note that running multiple nodes on a single host is useful for testing CockroachDB, but it's not suitable for production. To run a physically distributed cluster in containers, use an orchestration tool like Kubernetes. See Orchestration for more details, and review the Production Checklist.
Step 1. Create a bridge network
Since you'll be running multiple Docker containers on a single host, with one CockroachDB node per container, create a Docker bridge network. The network has configurable properties such as a pool of IP addresses, network gateway, and routing rules. All nodes will connect to this network and can communicate openly by default, but incoming traffic can reach a container only through the container's published port mappings, as described in Step 3: Start the cluster. Because the network is a bridge, from the point of view of the client, the Docker host seems to service the request directly.
docker network create -d bridge roachnet
To customize your bridge network or create a different type of Docker network, refer to Docker's documentation for docker network create
.
In subsequent steps, replace roachnet
with the name of your Docker network.
Step 2: Create Docker volumes for each cluster node
Cockroach Labs recommends that you store cluster data in Docker volumes rather than in the storage layer of the running container. Using a volume has the following advantages over using bind mounts or writing directly to the running container's filesystem.
- Volumes are managed entirely by Docker. A bind mount mounts an arbitrary directory on the Docker host into the container, and that directory could potentially be modified or deleted by any process with permission.
- Volumes persist even if the containers that were using it are deleted. A container's local storage is temporarily unavailable if the container is stopped, and is permanently removed if the container is deleted.
- When compared to a container's local storage, writing to either a local volume or a bind mount has considerably better performance because it uses fewer kernel system calls on the Docker host. For an explanation, refer to Manage Data in Docker.
- A volume can be backed up, restored, or migrated to a different container or Docker host. Refer to Back Up, Restore, or Migrate Data Volumes.
- A volume can be pre-populated before connecting it to a container. Refer to Populate a Volume Using a Container.
- A volume can be backed by local storage, a cloud storage resource, SSH, NFS, Samba, or raw block storage, among others. For details, refer to Use a Volume Driver.
Avoid using the -v
/ --volume
command to mount a local macOS filesystem into the container. Use Docker volumes or a tmpfs
mount.
Create a Docker volume for each container. You can create only one volume at a time.
docker volume create roach1
docker volume create roach2
docker volume create roach3
Step 3. Start the cluster
This section shows how to start a three-node cluster where:
- Each node will store its data in a unique Docker volume.
- Each node will listen for SQL and HTTP connections at a unique port each on the
roachnet
network, and these ports are published. Client requests to the Docker host at a given port are forwarded to the container that is publishing that port. Nodes do not listen onlocalhost
. - Each node will listen and advertise for inter-node cluster traffic at port 26357 on the
roachnet
network. This port is not published, so inter-node traffic does not leave this network.
When SQL and inter-node traffic are separated, some client commands need to be modified with a --host
flag or a --uri
connection string. Some commands, such as cockroach init
, default to port 26257 but must use the inter-node traffic port (the --listen-addr
or --advertise-addr
) rather than the SQL traffic port when traffic is separated.
Start the first node and configure it to listen on
roach1:26257
for SQL clients androach1:8080
for the DB Console and to publish these ports, and to useroach1:26357
for inter-node traffic. The Docker host will forward traffic to a published port to the publishing container.CockroachDB starts in insecure mode and a
certs
directory is not created.docker run -d ' --name=roach1 ' --hostname=roach1 ' --net=roachnet ' -p 26257:26257 ' -p 8080:8080 ' -v "roach1:/cockroach/cockroach-data" ' cockroachdb/cockroach:v22.2.19 start ' --advertise-addr=roach1:26357 ' --http-addr=roach1:8080 ' --listen-addr=roach1:26357 ' --sql-addr=roach1:26257 ' --insecure ' --join=roach1:26357,roach2:26357,roach3:26357
This command creates a container and starts the first CockroachDB node inside it. Take a moment to understand each part:
docker run
: The Docker command to start a new container.-d
: This flag runs the container in the background so you can continue the next steps in the same shell.--name
: The name for the container. This is optional, but a custom name makes it significantly easier to reference the container in other commands, for example, when opening a Bash session in the container or stopping the container.--hostname
: The hostname for the container. You will use this to join other containers/nodes to the cluster.--net
: The bridge network for the container to join. See step 1 for more details.-p 26257:26257 -p 8080:8080
: These flags map the default port for inter-node and client-node communication (26257
) and the default port for HTTP requests to the DB Console (8080
) from the container to the host. This enables inter-container communication and makes it possible to call up the DB Console from a browser.-v "roach1:/cockroach/cockroach-data"
: This flag mounts theroach1
Docker volume into the container's filesystem at/cockroach/cockroach-data/
. This volume will contain data and logs for the container, and the volume will persist after the container is stopped or deleted. For more details, see Docker's volumes documentation.cockroachdb/cockroach:v22.2.19 start (...) --join
: The CockroachDB command to start a node in the container. The--advertise-addr
,--http-addr
,--listen-addr
, and--sql-addr
flags cause CockroachDB to listen on separate ports for inter-node traffic, DB Console traffic, and SQL traffic. The--join
flag contains each node's hostname or IP address and the port where it listens for inter-node traffic from other nodes.
Start the second node and configure it to listen on
roach2:26258
for SQL clients androach2:8081
for the DB Console and to publish these ports, and to useroach2:26357
for inter-node traffic. The offsets for the published ports avoid conflicts withroach1
's published ports. The named volumeroach2
is mounted in the container at/cockroach/cockroach-data
.CockroachDB starts in insecure mode and a
certs
directory is not created.docker run -d ' --name=roach2 ' --hostname=roach2 ' --net=roachnet ' -p 26258:26258 ' -p 8081:8081 ' -v "roach2:/cockroach/cockroach-data" ' cockroachdb/cockroach:v22.2.19 start ' --advertise-addr=roach2:26357 ' --http-addr=roach2:8081 ' --listen-addr=roach2:26357 ' --sql-addr=roach2:26258 ' --insecure ' --join=roach1:26357,roach2:26357,roach3:26357
Start the third node and configure it to listen on
roach3:26259
for SQL clients androach2:8082
for the DB Console and to publish these ports, and to useroach3:26357
for inter-node traffic. The offsets for the published ports avoid conflicts withroach1
's androach2
's published ports. The named volumeroach3
is mounted in the container at/cockroach/cockroach-data
.docker run -d ' --name=roach3 ' --hostname=roach3 ' --net=roachnet ' -p 26259:26259 ' -p 8082:8082 ' -v "roach3:/cockroach/cockroach-data" ' cockroachdb/cockroach:v22.2.19 start ' --advertise-addr=roach3:26357 ' --http-addr=roach3:8082 ' --listen-addr=roach3:26357 ' --sql-addr=roach3:26259 ' --insecure ' --join=roach1:26357,roach2:26357,roach3:26357
Perform a one-time initialization of the cluster. This example runs the
cockroach init
command from within theroach1
container, but you can run it from any container or from an external system that can reach the Docker host.cockroach init
connects to the node's--advertise-addr
, rather than the node's--sql-addr
. Replaceroach1:26357
with the node's--advertise-addr
value. This example runs thecockroach
command directly on a cluster node, but you can run it from any system that can connect to the Docker host.docker exec -it roach1 ./cockroach --host=roach1:26357 init --insecure
The following message displays:
Cluster successfully initialized
Each node also prints helpful startup details to its log. For example, the following command runs the
grep
command from within theroach1
container to display lines in its/cockroach-data/logs/cockroach.log
log file that contain the stringnode starting
and the next 11 lines.docker exec -it roach1 grep 'node starting' /cockroach-data/logs/cockroach.log -A 11
The output will look something like this:
CockroachDB node starting at build: CCL v22.2.19 @ 2024-02-26 00:00:00 (go1.19.6) webui: http://roach1:8080 sql: postgresql://root@roach1:26357?sslmode=disable client flags: /cockroach/cockroach <client cmd> --host=roach1:26357 logs: /cockroach/cockroach-data/logs temp dir: /cockroach/cockroach-data/cockroach-temp273641911 external I/O path: /cockroach/cockroach-data/extern store[0]: path=/cockroach/cockroach-data status: initialized new cluster clusterID: 1a705c26-e337-4b09-95a6-6e5a819f9eec nodeID: 1
Step 4. Use the built-in SQL client
Now that your cluster is live, you can use any node as a SQL gateway. To test this out, let's use the docker exec
command to start the built-in SQL shell in the roach1
container.
Start the SQL shell in a container or from an external system that can reach the Docker host. Set
--host
to the Docker host's IP address and use any of the ports where nodes are listening for SQL connections,26257
,26258
, or26259
. This example connects the SQL shell within theroach1
container toroach2:26258
. You could also connect toroach3:26259
.docker exec -it roach1 ./cockroach sql --host=roach2:26258 --insecure
Run some basic CockroachDB SQL statements:
> 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;
id | balance +----+---------+ 1 | 1000.50 (1 row)
Exit the SQL shell on
roach1
and open a new shell onroach2
:> \q
docker exec -it roach2 ./cockroach --host=roach2:26258 sql --insecure
Run the same
SELECT
query as before:> SELECT * FROM bank.accounts;
id | balance +----+---------+ 1 | 1000.50 (1 row)
As you can see, node 1 and node 2 behaved identically as SQL gateways.
Exit the SQL shell on node 2:
> \q
Step 5. Run a sample workload
CockroachDB also comes with a number of built-in workloads for simulating client traffic. Let's run the workload based on CockroachDB's sample vehicle-sharing application, MovR.
The cockroach workload
command does not support connection or security flags like other cockroach
commands. Instead, you must use a connection string at the end of the command.
Load the initial dataset on
roach1:26257
docker exec -it roach1 ./cockroach workload init movr 'postgresql://root@roach1:26257?sslmode=disable'
Run the workload for 5 minutes:
docker exec -it roach1 ./cockroach workload run movr --duration=5m 'postgresql://root@roach1:26257?sslmode=disable'
Step 6. Access the DB Console
The DB Console gives you insight into the overall health of your cluster as well as the performance of the client workload.
When you started the first node's container, you mapped the node's default HTTP port
8080
to port8080
on the Docker host, so go to http://localhost:8080. If necessary, replacelocalhost
with the hostname or IP address of the Docker host.On the Cluster Overview, notice that three nodes are live, with an identical replica count on each node:
This demonstrates CockroachDB's automated replication of data via the Raft consensus protocol.
Note:Capacity metrics can be incorrect when running multiple nodes on a single machine. For more details, see this limitation.
Click Metrics to access a variety of time series dashboards, including graphs of SQL queries and service latency over time:
Use the Databases, Statements, and Jobs pages to view details about your databases and tables, to assess the performance of specific queries, and to monitor the status of long-running operations like schema changes, respectively.
Optionally verify that DB Console instances for
roach2
androach3
are reachable on ports 8081 and 8082 and show the same information as port 8080.
The CockroachDB DB Console gives you insight into the overall health of your cluster as well as the performance of the client workload.
When you started the first container/node, you mapped the node's default HTTP port
8080
to port8080
on the host, so go to http://localhost:8080.On the Cluster Overview, notice that three nodes are live, with an identical replica count on each node:
This demonstrates CockroachDB's automated replication of data via the Raft consensus protocol.
Note:Capacity metrics can be incorrect when running multiple nodes on a single machine. For more details, see this limitation.
Click Metrics to access a variety of time series dashboards, including graphs of SQL queries and service latency over time:
Use the Databases, Statements, and Jobs pages to view details about your databases and tables, to assess the performance of specific queries, and to monitor the status of long-running operations like schema changes, respectively.
Step 6. Stop the cluster
Use the
docker stop
anddocker rm
commands to stop and remove the containers (and therefore the cluster). By default,docker stop
sends aSIGTERM
signal, waits for 10 seconds, and then sends aSIGKILL
signal. Cockroach Labs recommends that you allow between 5 and 10 minutes before forcibly stopping thecockroach
process, so this example sets the grace period to 5 minutes. If you do not plan to restart the cluster, you can omit-t
.docker stop -t 300 roach1 roach2 roach3
docker rm roach1 roach2 roach3
If you do not plan to restart the cluster, you can also remove the Docker volumes and the Docker network:
docker volume rm roach1 roach2 roach3
docker network rm roachnet
What's next?
- Learn more about CockroachDB SQL and the built-in SQL client
- Install the client driver for your preferred language
- Build an app with CockroachDB
- Further explore CockroachDB capabilities like fault tolerance and automated repair, multi-region performance, serializable transactions, and JSON support