Play With Docker

-download cassandra docker image
docker pull cassandra
docker image pull cassandra
docker container run cassandra
docker run -ti cassandra /bin/sh

-run cassandra docker image
docker run -d cassandra
-d -> run container in background and print container ID
docker run --name cass1 -d cassandra
--name -> set container name

first machine
docker run --name cass1 -d -e CASSANDRA_BROADCAST_ADDRESS=192.168.10.42 -p 7000:7000 cassandra
second machine
docker run --name cass2 -d -e CASSANDRA_BROADCAST_ADDRESS=192.168.10.43 -p 7000:7000 -e CASSANDRA_SEEDS=192.168.10.42 cassandra


BACKUP DOCKER IMAGE
To backup docker images, use the docker save command that will produce a tar archive that can be used later on to create a new docker image with the docker load command.
docker save cassandra > cassandra-docker-image-backup.tar

BACKUP DOCKER CONTAINER
You can backup a docker container by different means;
-by committing a new docker image based on the docker container current state using the docker commit command
-by exporting the docker container file system as a tar archive using the docker export command. You can later on create a new docker image from that tar archive with the docker import command.
Be aware that those commands will only backup the docker container layered file system. This excludes the data volumes.
docker export cass > cass-container-backup.tar

SIMPLE DOCKER COMPOSE START
docker-compose up -d
By default, Compose looks for docker-compose.yml. If you have named you file differently you must use the -f flag. Example command follows: docker-compose -f docker-compose-different.yml up -d

Bu blogdaki popüler yayınlar

About Android padding, margin, width, height, wrap_content, match_parent, R Class

Padding and Margin padding  and  layout_margin  are two very similar attributes. Both determine the space around a View. The difference is that  padding  determines space within the boundaries of the view, and  layout_margin  determines the space outside the boundaries of the view. Width and Height Some of the most important properties are the width property and height property - those must be defined for every view. Remember that all views occupy a rectangular area on the screen - the width and height are the width and height of that area. You can define this in pixels, or better yet dp (stands for density-independent pixels): android:layout_width="200dp" android:layout_height="300dp" For the sake of having a layout be responsive and adjust to different devices, two common values are not numbers at all, but  wrap_content  and  match_parent  used as shown here: android:layout_width="wrap_content" android:layout_height="match_parent"
Devamı

@SerializedName and @Expose annotations

The  @SerializedName  annotation is needed for Gson to map the JSON keys with our fields. In keeping with Java's camelCase naming convention for class member properties, it is not recommended to use underscores to separate words in a variable.  @SerializedName  helps translate between the two. @SerializedName ( "quota_remaining" ) @Expose private Integer quotaRemaining; In the example above, we are telling Gson that our JSON key  quota_remaining  should be mapped to the Java field  quotaRemaining .  If both of these values were the same, i.e. if our JSON key was  quotaRemaining  just like the Java field, then there would be no need for the  @SerializedName  annotation on the field because Gson would map them automatically. The  @Expose  annotation indicates that this member should be exposed for JSON serialization or deserialization. 
Devamı