Following the course, updating where needed but not coding along to video. Once a concept is known I pause the video and create tests/ code myself. Only copy pasting template.html.
Org: Gra-m
Original By: John Thompson
On: 28/03/2022
see petclinic for earlier examples of techniques not used before
- Exception Handling:
- @ResponseStatus custom exception -> which HTTP status is thrown globally #78
- @ExceptionHandler -> @Controller level #79
- Using command or 'form' objects
RudeComment-PossInterestingRefactorExercise
DataValidation Cheat Sheet @NotBlank Deprecated
Table of Contents:
- @ResponseStatus custom exception -> which HTTP status is thrown globally #78
- @ExceptionHandler -> @Controller level #79
- Interface: HandlerExceptionResolver
- ExceptionHandlerExceptionResolver -> matches uncaught exceptions to @ExceptionHandler
- ResponseStatusExceptionResolver -> looks for uncaught exceptions matching @ResponseStatus
- DefaultHandlerExceptionResolver -> (Internal to SpringMvc) converts standard Spring exceptions to HTTP status codes
- Just HTTP status == @ResponseStatus
- Redirection to view needed = SimpleMappingExceptionResolver
- both? == @ExceptionHandler on controller
Start a container:
docker run -dp 3000:3000 docker/getting-started
Start Docker tutorial:
docker run -d -p 80:80 docker/getting-started
Building
Dockerfile @ root of project
FROM node:12-alpine
# Adding build tools to make yarn install work on Apple silicon / arm64 machines
RUN apk add --no-cache python2 g++ make
WORKDIR /app
COPY . .
RUN yarn install --production
CMD ["node", "src/index.js"]
Build docker image from the directory of its dockerfile:
docker build -t getting-started .
where getting started is the tagname -d what’s that?
docker run -d <image name> #runs it as a background process.
List all docker images on system:
docker images
Map host port to container port:
docker run -p 8080:34224 <image name>
Removing
Get container id:
docker ps
Stop container:
docker stop container-id
or
docker kill <container name>
Remove
docker rm container-id
Stop and Remove 1 step:
docker rm -f container-id
Tail (show last part of log)
docker logs -f <container name>
Docker hub, create public repo Create Repo to share:
untagged == fail:
$ docker push [username]/getting-started
#Refers to repo docker.io/[username]/getting-started
Error: An image does not exist locally with the tag: [username]/getting/started
TAG FIRST:
docker tag getting-started Gra8m/getting-started
THEN:
docker push Gra8m/getting-started
Start container with a file named /data.txt with a random num 1-10000 docker run -d ubuntu bash -c "shuf -i 1-10000 -n 1 -o /data.txt && tail -f /dev/null"
see output, [exec]ute the container:
docker exec container-id cat /data.txt
List contents of ubuntu file system
docker run -it ubuntu ls /
Persisting data with a volume exercise:
Create a volume, to enable persistence between different containers of the same image
docker volume create todo-db
Run container with -v flag specifying a volume to mount.
docker run -dp 3000:3000 -v todo-db:/etc/todos gra8m/getting-started
Remove container for todo app:
docker ps
docker rm -f container-id
Inspect a volume: docker volume inspect volume-name
PS D:\OtherDesktop> docker volume inspect todo-db
[
{
"CreatedAt": "2022-05-04T06:38:19Z",
"Driver": "local",
"Labels": {},
"Mountpoint": "/var/lib/docker/volumes/todo-db/_data",
"Name": "todo-db",
"Options": {},
"Scope": "local"
}
]
PS D:\OtherDesktop>
Use Binding Mounts with Dev-Mode containers to show live changes (next) for now going back to SF guru Java oriented tut.
SFG Tut commands:
Delete all Docker Images:
docker rmi ${docker images -q}
Show all Docker Images
docker images -a
Run Ubuntu Container
docker run -it ubuntu bash
SFG Tut Clean up:
Kill all containers Working - tested May 11, 2022
docker kill $(docker ps -q)
Delete all containers: Working - tested May 11, 2022
docker rm $(docker ps -a -q)
Delete dangling images: Not working tested May 11, 2022 Editing and then naming a new image with an old name does not overwrite, it leaves a dangler.
docker rmi $(docker images -q -f dangling=true)
Delete all images: Not tested
docker rmi $(docker images -q)
Delete a single image:
docker rmi <image name>
Delete volumes: Tested working May 11, 2022
docker volume rm $(docker volume ls -f dangling=true -q)
See console output of a docker container:
docker logs <container name>
How do you shell into a docker container?
docker exec -it bash
How do you share storage on the host sys with a docker container?
-v :
#Eg:
docker run -v :
MONGO
Will get latest:
docker pull mongo
Will run in background with mapped port that we can access locally → 27017
PS D:\> docker run -dp 27017:27017 mongo
Full tag: registry.hub.docker.com/mongo:latest
latest is default registry.hub.docker.com/gra8m/image-name
Image IDs (SHA 12d built from layer SHAs) can be given a human readable tag: TAG FIRST:
docker tag getting-started Gra8m/getting-started
THEN:
docker push Gra8m/getting-started
DB State where VOLUME is to be held as permanent DataBases:
docker run -dp 27017:27017 -v test1:\docker_storage\mongo mongo
The above is creating test 1 but not able to specify D:\
RABBITMQ Docker
need management console:
docker run -d --hostname my-rabbit --name second-rabbit -p 8080:15672 rabbitmq:3-management
standard login == guest guest
-e environment vars
Specify an environment var:
docker run -e MY_VAR=my_prop <image name>
MYSQL Docker
docker run --name some-mysql -v /HELLO/CANYOUFINDME/IWASMADE:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -p 3306:3306 -d mysql:8.0
docker run --name mysql-into-temp-question -e MYSQL_ALLOW_EMPTY_PASSWORD=yes -p 3306:3306 -d mysql:latest
# tried the below from users/gra_m/pwd no sql file in folder (wind vs his osx?) b
docker run --name some-mysql -v mySqlDb:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -p 3306:3306 -d mysql:8.0
CENTOS image: https://stackoverflow.com/questions/30209776/docker-container-will-automatically-stop-after-docker-run-d
Running centos linux image in -d means that it automatically closes, instead run:
docker run -t -d centos/ubuntu
The following assumes you have bash installed on windows ‘winpty’ available:
Then bash into it -it is interactive mode: May 11, 2022 worked
winpty docker exec -it strange_burnell bash
[root@6ba86e333b2d /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var
[root@6ba86e333b2d /]# ps -ef # shows what running
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 19:34 pts/0 00:00:00 /bin/bash
root 15 0 0 19:38 pts/1 00:00:00 bash
root 30 15 0 19:41 pts/1 00:00:00 ps -ef
[root@6ba86e333b2d /]#
#DEADEND --> install of java via yum failed for centos. So repeated the above with ubuntu then:
RUN apt update
RUN apt-get install openjdk-11-jre
Ubuntu instead of Centos (see above): https://stackoverflow.com/questions/61815233/install-java-runtime-in-debian-based-docker-image