How to fix wekan Path "/data/attachments" is not writable!

Problem:

While starting your dockerized wekan setup, you see an error message like this:

wekan_1    | errorClass [Error]: [FilesCollection.attachments] Path "/data/attachments" is not writable! [401]
wekan_1    |     at new FilesCollection (packages/ostrio:files/server.js:354:15)
wekan_1    |     at module (models/attachments.js:52:15)
wekan_1    |     at fileEvaluate (packages/modules-runtime.js:336:7)
wekan_1    |     at Module.require (packages/modules-runtime.js:238:14)
wekan_1    |     at Module.moduleLink [as link] (/build/programs/server/npm/node_modules/meteor/modules/node_modules/@meteorjs/reify/lib/runtime/index.js:52:22)
wekan_1    |     at module (server/publications/attachments.js:1:24)
wekan_1    |     at fileEvaluate (packages/modules-runtime.js:336:7)
wekan_1    |     at Module.require (packages/modules-runtime.js:238:14)
wekan_1    |     at require (packages/modules-runtime.js:258:21)
wekan_1    |     at /build/programs/server/app/app.js:162362:1
wekan_1    |     at /build/programs/server/boot.js:401:38
wekan_1    |     at Array.forEach (<anonymous>)
wekan_1    |     at /build/programs/server/boot.js:226:21
wekan_1    |     at /build/programs/server/boot.js:464:7
wekan_1    |     at Function.run (/build/programs/server/profile.js:280:14)
wekan_1    |     at /build/programs/server/boot.js:463:13 {
wekan_1    |   isClientSafe: true,
wekan_1    |   error: 401,
wekan_1    |   reason: '[FilesCollection.attachments] Path "/data/attachments" is not writable!',
wekan_1    |   details: Error: EACCES: permission denied, mkdir '/data/attachments'
wekan_1    |       at Object.mkdirSync (fs.js:1014:3)
wekan_1    |       at new FilesCollection (packages/ostrio:files/server.js:348:10)
wekan_1    |       at module (models/attachments.js:52:15)
wekan_1    |       at fileEvaluate (packages/modules-runtime.js:336:7)
wekan_1    |       at Module.require (packages/modules-runtime.js:238:14)
wekan_1    |       at Module.moduleLink [as link] (/build/programs/server/npm/node_modules/meteor/modules/node_modules/@meteorjs/reify/lib/runtime/index.js:52:22)
wekan_1    |       at module (server/publications/attachments.js:1:24)
wekan_1    |       at fileEvaluate (packages/modules-runtime.js:336:7)
wekan_1    |       at Module.require (packages/modules-runtime.js:238:14)
wekan_1    |       at require (packages/modules-runtime.js:258:21)
wekan_1    |       at /build/programs/server/app/app.js:162362:1
wekan_1    |       at /build/programs/server/boot.js:401:38
wekan_1    |       at Array.forEach (<anonymous>)
wekan_1    |       at /build/programs/server/boot.js:226:21
wekan_1    |       at /build/programs/server/boot.js:464:7
wekan_1    |       at Function.run (/build/programs/server/profile.js:280:14)
wekan_1    |       at /build/programs/server/boot.js:463:13 {
wekan_1    |     errno: -13,
wekan_1    |     syscall: 'mkdir',
wekan_1    |     code: 'EACCES',
wekan_1    |     path: '/data/attachments'
wekan_1    |   },
wekan_1    |   errorType: 'Meteor.Error'
wekan_1    | }

Solution

You have mounted a local directory as wekan data directory, for example like this in docker-compose.yml:

wekan:
  image: quay.io/wekan/wekan
  /* ... */
  environment:
    /*...*/
    - WRITABLE_PATH=/data
  volumes:
    - ./wekan_data:/data

But this directory does not have the correct permissions set. You can fix it using this command on the directory(wekan_data in this example):

sudo chown -R 999:999 wekan_data

After that, restart wekan and the issue should be fixed.