Use --shm-size=2g in selenium docker contaier run command.

.travis.dist.yml

@@ -32,7 +32,7 @@ before_install:
   - cd ../..
   - composer create-project -n --no-dev --prefer-dist blackboard-open-source/moodle-plugin-ci ci ^2
   - export PATH="$(cd ci/bin; pwd):$(cd ci/vendor/bin; pwd):$PATH"
-  - docker run -d -p 127.0.0.1:4444:4444 --net=host -v /dev/shm:/dev/shm -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-firefox:2.53.1
+  - docker run -d -p 127.0.0.1:4444:4444 --net=host --shm-size=2g -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-firefox:2.53.1
 
 install:
   - moodle-plugin-ci install

.travis.yml

@@ -34,7 +34,7 @@ before_install:
   - export PATH="$(cd bin; pwd):$(cd vendor/bin; pwd):$PATH"
   - export TRAVIS_BUILD_DIR=$(cd ../moodle-local_travis; pwd)
   # Start Selenium Standalone with Chrome.
-  - docker run -d -p 127.0.0.1:4444:4444 --net=host -v /dev/shm:/dev/shm -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-chrome:3
+  - docker run -d -p 127.0.0.1:4444:4444 --net=host --shm-size=2g -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-chrome:3
 
 install:
   - moodle-plugin-ci install
@@ -60,7 +60,6 @@ jobs:
     - stage: Tests
       addons: skip
       install:
-        - phpenv config-rm xdebug.ini
         - make init
       script:
         - make validate

docs/TravisFileExplained.md

@@ -70,7 +70,7 @@ before_install:
 # prefer to run Behat tests with Chrome profile (see Behat step details below),
 # use selenium/standalone-chrome:3 image instead. If you don't run Behat tests,
 # this step is not needed.
-  - docker run -d -p 127.0.0.1:4444:4444 --net=host -v /dev/shm:/dev/shm -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-firefox:2.53.1
+  - docker run -d -p 127.0.0.1:4444:4444 --net=host --shm-size=2g -v $HOME/build/moodle:$HOME/build/moodle selenium/standalone-firefox:2.53.1
 
 # This lists steps that are run for installation and setup.
 install: