more Docker in Action

docker run -d --volume /var/lib/cassandra/data --name cass-shared alpine echo Data Container

docker run -d --volumes-from cass-shared --name cass1 cassandra:2.2

docker run -it --rm --link cass1:cass cassandra:2.2 cqlsh cass

select * from system.schema_keyspaces where keyspace_name = 'docker_hello_world';

create keyspace docker_hello_world with replication = { 'class' : 'SimpleStrategy', 'replication_factor': 1 };

select * from system.schema_keyspaces where keyspace_name = 'docker_hello_world';

quit

docker stop cass1
docker rm -vf cass1

docker run -d --volumes-from cass-shared --name cass2 cassandra:2.2
docker run -it --rm --link cass2:cass cassandra:2.2 cqlsh cass
select * from system.schema_keyspaces where keyspace_name = 'docker_hello_world';

quit

docker rm -vf cass2 cass-shared

#bind-mount volumes point to a space on the host 


cd 
mkdir example-docs
echo "ciao"> example-docs/index.html

docker run -d --name bmweb -v ~/example-docs:/usr/local/app 80:80 httpd:latest

#enter localhost:80 in your browser, you should see "ciao"

#create a file on the guest system
docker run --rm -v ~/example-docs:/testspace alpine /bin/sh -c 'echo test > /testspace/test'

#this will fail - read only
docker run --rm -v ~/example-docs:/testspace:ro alpine /bin/sh -c 'echo test2 > /testspace/test'

#check how the volume is mounted
docker run --rm -v ~/example-docs/absent:/absent alpine:latest /bin/sh -c 'mount | grep absent'