Cal.com (formerly Calendso)

The open-source Calendly alternative. (Docker Edition)
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Important Notes

Support for this image can be found via the repository, located at https://github.com/calcom/docker

Docker

This image can be found on DockerHub at https://hub.docker.com/r/calcom/cal.com.

Note for ARM Users: Use the {version}-arm suffix for pulling images. Example: docker pull calcom/cal.com:v5.6.19-arm.

The Docker configuration for Cal.com is an effort powered by people within the community. Cal.com, Inc. does not yet provide official support for Docker, but we will accept fixes and documentation at this time. Use at your own risk.

Requirements

Make sure you have docker & docker compose installed on the server / system. Both are installed by most docker utilities, including Docker Desktop and Rancher Desktop.

Note: docker compose without the hyphen is now the primary method of using docker-compose, per the Docker documentation.

(Most users) Running Cal.com with Docker Compose

If you are evaluating Cal.com or running with minimal to no modifications, this option is for you.

1. Clone calcom/docker.

   git clone --recursive https://github.com/calcom/docker.git

2. Change into the directory

   cd docker

3. Prepare your configuration: Rename .env.example to .env and then update .env

   cp .env.example .env

   Most configurations can be left as-is, but for configuration options see Important Run-time variables below.

   Update the appropriate values in your .env file, then proceed.

4. (optional) Pre-Pull the images by running the following command:

   docker compose pull

   This will use the default image locations as specified by image: in the docker-compose.yaml file.

   Note: To aid with support, by default Scarf.sh is used as registry proxy for download metrics.

5. Start Cal.com via docker compose

   (Most basic users, and for First Run) To run the complete stack, which includes a local Postgres database, Cal.com web app, and Prisma Studio:

   docker compose up -d

   To run Cal.com web app and Prisma Studio against a remote database, ensure that DATABASE_URL is configured for an available database and run:

   docker compose up -d calcom studio

   To run only the Cal.com web app, ensure that DATABASE_URL is configured for an available database and run:

   docker compose up -d calcom

   Note: to run in attached mode for debugging, remove -d from your desired run command.

6. Open a browser to http://localhost:3000, or your defined NEXT_PUBLIC_WEBAPP_URL. The first time you run Cal.com, a setup wizard will initialize. Define your first user, and you're ready to go!

Updating Cal.com

1. Stop the Cal.com stack

   docker compose down

2. Pull the latest changes

   docker compose pull

3. Update env vars as necessary.

4. Re-start the Cal.com stack

   docker compose up -d

(Advanced users) Build and Run Cal.com

1. Clone calcom/docker.

   git clone https://github.com/calcom/docker.git calcom-docker

2. Change into the directory

   cd calcom-docker

3. Update the calcom submodule. This project depends on the Cal.com source code, which is included here as a Git submodule. To make sure you get everything you need, update the submodule with the command below.

   git submodule update --remote --init

   Note: DO NOT use recursive submodule update, otherwise you will receive a git authentication error.

4. Rename .env.example to .env and then update .env

   For configuration options see Build-time variables below. Update the appropriate values in your .env file, then proceed.

5. Build the Cal.com docker image:

   Note: Due to application configuration requirements, an available database is currently required during the build process.

   a) If hosting elsewhere, configure the DATABASE_URL in the .env file, and skip the next step

   b) If a local or temporary database is required, start a local database via docker compose.

   docker compose up -d database

6. Build Cal.com via docker compose (DOCKER_BUILDKIT=0 must be provided to allow a network bridge to be used at build time. This requirement will be removed in the future)

   DOCKER_BUILDKIT=0 docker compose build calcom

7. Start Cal.com via docker compose

   (Most basic users, and for First Run) To run the complete stack, which includes a local Postgres database, Cal.com web app, and Prisma Studio:

   docker compose up -d

   To run Cal.com web app and Prisma Studio against a remote database, ensure that DATABASE_URL is configured for an available database and run:

   docker compose up -d calcom studio

   To run only the Cal.com web app, ensure that DATABASE_URL is configured for an available database and run:

   docker compose up -d calcom

   Note: to run in attached mode for debugging, remove -d from your desired run command.

8. Open a browser to http://localhost:3000, or your defined NEXT_PUBLIC_WEBAPP_URL. The first time you run Cal.com, a setup wizard will initialize. Define your first user, and you're ready to go!

Configuration

Important Run-time variables

These variables must also be provided at runtime

Variable	Description	Required	Default
DATABASE_URL	database url with credentials - if using a connection pooler, this setting should point there	required	postgresql://unicorn_user:magical_password@database:5432/calendso
CALCOM_LICENSE_KEY	Enterprise License Key	optional
NEXT_PUBLIC_WEBAPP_URL	Base URL of the site. NOTE: if this value differs from the value used at build-time, there will be a slight delay during container start (to update the statically built files).	optional	http://localhost:3000
NEXTAUTH_URL	Location of the auth server. By default, this is the Cal.com docker instance itself.	optional	{NEXT_PUBLIC_WEBAPP_URL}/api/auth
NEXTAUTH_SECRET	must match build variable	required	secret
CALENDSO_ENCRYPTION_KEY	must match build variable	required	secret

Build-time variables

If building the image yourself, these variables must be provided at the time of the docker build, and can be provided by updating the .env file. Currently, if you require changes to these variables, you must follow the instructions to build and publish your own image.

Updating these variables is not required for evaluation, but is required for running in production. Instructions for generating variables can be found in the Cal.com instructions

Variable	Description	Required	Default
DATABASE_URL	database url with credentials - if using a connection pooler, this setting should point there	required	postgresql://unicorn_user:magical_password@database:5432/calendso
MAX_OLD_SPACE_SIZE	Needed for Nodejs/NPM build options	required	4096
NEXT_PUBLIC_LICENSE_CONSENT	license consent - true/false	required
NEXTAUTH_SECRET	Cookie encryption key	required	secret
CALENDSO_ENCRYPTION_KEY	Authentication encryption key	required	secret
NEXT_PUBLIC_WEBAPP_URL	Base URL injected into static files	optional	http://localhost:3000
NEXT_PUBLIC_WEBSITE_TERMS_URL	custom URL for terms and conditions website	optional	https://cal.com/terms
NEXT_PUBLIC_WEBSITE_PRIVACY_POLICY_URL	custom URL for privacy policy website	optional	https://cal.com/privacy
NEXT_PUBLIC_API_V2_URL	URL for the v2 API, only required for custom integrations or custom booking experiences using Cal.com Platform	optional
CALCOM_TELEMETRY_DISABLED	Allow Cal.com to collect anonymous usage data (set to 1 to disable)	optional
NEXT_PUBLIC_SINGLE_ORG_SLUG	Required if ORGANIZATIONS_ENABLED is true	optional
ORGANIZATIONS_ENABLED	Used for Enterprise or Organizations plan	optional

Git Submodules

This repository uses a git submodule.

For users building their own images, to update the calcom submodule, use the following command:

git submodule update --remote --init

For more advanced usage, please refer to the git documentation: https://git-scm.com/book/en/v2/Git-Tools-Submodules

Troubleshooting

SSL edge termination

If running behind a load balancer which handles SSL certificates, you will need to add the environmental variable NODE_TLS_REJECT_UNAUTHORIZED=0 to prevent requests from being rejected. Only do this if you know what you are doing and trust the services/load-balancers directing traffic to your service.

Failed to commit changes: Invalid 'prisma.user.create()'

Certain versions may have trouble creating a user if the field metadata is empty. Using an empty json object {} as the field value should resolve this issue. Also, the id field will autoincrement, so you may also try leaving the value of id as empty.

CLIENT_FETCH_ERROR

If you experience this error, it may be the way the default Auth callback in the server is using the WEBAPP_URL as a base url. The container does not necessarily have access to the same DNS as your local machine, and therefor needs to be configured to resolve to itself. You may be able to correct this by configuring NEXTAUTH_URL=http://localhost:3000/api/auth, to help the backend loop back to itself.

docker-calcom-1  | @calcom/web:start: [next-auth][error][CLIENT_FETCH_ERROR]
docker-calcom-1  | @calcom/web:start: https://next-auth.js.org/errors#client_fetch_error request to http://testing.localhost:3000/api/auth/session failed, reason: getaddrinfo ENOTFOUND testing.localhost {
docker-calcom-1  | @calcom/web:start:   error: {
docker-calcom-1  | @calcom/web:start:     message: 'request to http://testing.localhost:3000/api/auth/session failed, reason: getaddrinfo ENOTFOUND testing.localhost',
docker-calcom-1  | @calcom/web:start:     stack: 'FetchError: request to http://testing.localhost:3000/api/auth/session failed, reason: getaddrinfo ENOTFOUND testing.localhost\n' +
docker-calcom-1  | @calcom/web:start:       '    at ClientRequest.<anonymous> (/calcom/node_modules/next/dist/compiled/node-fetch/index.js:1:65756)\n' +
docker-calcom-1  | @calcom/web:start:       '    at ClientRequest.emit (node:events:513:28)\n' +
docker-calcom-1  | @calcom/web:start:       '    at ClientRequest.emit (node:domain:489:12)\n' +
docker-calcom-1  | @calcom/web:start:       '    at Socket.socketErrorListener (node:_http_client:494:9)\n' +
docker-calcom-1  | @calcom/web:start:       '    at Socket.emit (node:events:513:28)\n' +
docker-calcom-1  | @calcom/web:start:       '    at Socket.emit (node:domain:489:12)\n' +
docker-calcom-1  | @calcom/web:start:       '    at emitErrorNT (node:internal/streams/destroy:157:8)\n' +
docker-calcom-1  | @calcom/web:start:       '    at emitErrorCloseNT (node:internal/streams/destroy:122:3)\n' +
docker-calcom-1  | @calcom/web:start:       '    at processTicksAndRejections (node:internal/process/task_queues:83:21)',
docker-calcom-1  | @calcom/web:start:     name: 'FetchError'
docker-calcom-1  | @calcom/web:start:   },
docker-calcom-1  | @calcom/web:start:   url: 'http://testing.localhost:3000/api/auth/session',
docker-calcom-1  | @calcom/web:start:   message: 'request to http://testing.localhost:3000/api/auth/session failed, reason: getaddrinfo ENOTFOUND testing.localhost'
docker-calcom-1  | @calcom/web:start: }