Cypress error "The automation client disconnected. Cannot continue running tests." when running in Docker
This seems to occur when running out of shm space.
By default, Docker creates a container with a /dev/shm shared memory space of 64MB.This is typically too small for Chrome and could cause Chrome to crash.
I have found two options to resolve this:
- Disable usage of
/dev/shm:
// cypress/plugins/index.jsmodule.exports = (on, config) => { // ref: https://docs.cypress.io/api/plugins/browser-launch-api.html#Usage on('before:browser:launch', (browser = {}, args) => { if (browser.name === 'chrome') { args.push('--disable-dev-shm-usage') return args } return args })}- Increase the size of
/dev/shmin the container:
Run the container with docker run --shm-size=1gb (or whatever size you want)