I want to create a bash script that removes a user from a mongodb database that is running inside a docker container.
Normally through the terminal I would execute docker exec -it mycontainername bash
and then once I'm in the container I execute mongo mydbname --eval "db.users.remove({"firstname":"Bob"})"
I just have no idea how to do it in a linux bash script.
After I execute script that contains the docker exec command, it leaves the script and opens the docker container's terminal and prompts me to enter a command.
Would using the detached -d flag work?
Found out you can replace bash with the name of the shell you want to open, so in this case mongo.
Related
If we've to do some operations(execute commands) inside of docker container, we can go inside it and then execute commands -
docker exec -it <ContainerId> bash # go inside of container
cd /usr/local/tomcat/bin # hit command inside of container
./catalina.sh start # hit command inside of container
After this we need to hit Ctrl + C to come out of container.
But without going inside of container, can we execute commands inside of it from host directly like -
// command to attach to container
// command 1 to execute
// command 2 to execute
// no command required to come out of container as above commands directly hit from hosts
yes you can run your command at once:
docker exec -it <ContainerId> /usr/local/tomcat/bin/catalina.sh start
if you need to run multiple commands, you can pass them straight to bash:
docker exec -it <ContainerId> bash -c 'command1 && command2'
completely new to the shell script. I want to run the sql image (image is just there to take a db dump) and take a dump of the db and copy file to the host using shell script.
how i do manually is
1) docker run -it <image_name> bash (this takes in image bash)
2) mysqldump -h <ip> -u <user> -p db > filename.sql
3) docker cp <containerId>:/file/path/within/container /host/path/target (running this in host machine)
doing this i get the dump from container to host manually.
but while making shell script, i am having problem with the point 1) docker run -it <image_name> bash (this takes in image bash) since this takes me to the bash and i have to manually type the command.
how can i do it in the shell script.
any help will be greatly appreciated!
If I understand this correctly, you don't want to type those command manually and instead shell script should execute your command as and when you container is up and running. Now if you can modify sql related Dockerfile and can re-create image then use ENTRYPOINT [and if needed CMD] to execute shell script at startup. Check this link for details on ENTRYPOINT shell script.
Else, if you cannot recreate image then check this post i.e. how to run bash script from run command.
NOTE in both these cases you will have to mount your directory/volume and your sqldump command should copy dump this map volume/directory
You can pass the command to Bash as a parameter:
docker run -it <image_name> --name sqldump bash -c "mysqldump -h <ip> -u <user> -p db > /tmp/filename.sql"
docker cp sqldump:/tmp/filename.sql /path/on/host/filename.sql
Ignore the Docker steps, and just run mysqldump on your host. The -h option is the IP address or DNS name of the host running the database (can be 127.0.0.1 if the container is running on the same host, but not localhost because MySQL misinterprets that); if you mapped the database external port to a non-default port, you also need a -P (capital P) option to specify that port.
For example, if you started the container with
docker run -p 5433:5432 ... mysql:8
then you can take the dump from the host with
mysqldump -h 127.0.0.1 -P 5433 -p db > dump.sql
and not worry about the Docker details at all.
I am new to Linux stuff and would like to know how to run command while opening the shell through /bin/bash?
Eg the steps that I want to perform:
Step1: Run the docker exec command to start the quickstart virtual machine.
$ docker exec -it 7f8c1a16e5b2 /bin/bash
Step2: The above command gives the handle of the quickstart vm on the console. Now I want to run the below command by default when ever some one starts the docker quickstart console (step 1)
cd
. ./.bash_profile
I need some guidance on how to do this. Obviously, putting all these statements in one shell script isn't helping as the commands of Step2 are to be executed in the newly opened shell (of quickstart vm). The idea is to put all these statements in a single shell script and execute it when we want to get hold of the session within the VM console.
You can pass the commands you want to be executed inside the container to bash with the -c option.
That would look something like this:
docker exec -it 7f8c1a16e5b2 /bin/bash -c "cd && . ./.bash_profile && /bin/bash"
I am trying to get a shell inside the Docker container moul/phoronix-test-suite on Docker Hub using this command
docker run -t -i moul/phoronix-test-suite /bin/bash
but just after executing the command (binary file), the container stops and I get no shell into it.
[slazer#localhost ~]$ docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0993189463e6 moul/phoronix-test-suite "phoronix-test-suite " 7 seconds ago Exited (0) 3 seconds ago kickass_shockley
It is a ubuntu:trusty container. How can I get a shell into it, so that I can send arguments to the command phoronix-test-suite?
docker run -t -i moul/phoronix-test-suite /bin/bash will not give you a bash (contrary to docker run -it fedora bash)
According to its Dockerfile, what it will do is execute
phoronix-test-suite /bin/bash
Meaning, it will pass /bin/bash as parameter to phoronix-test-suite, which will exit immediately. That leaves you no time to execute a docker exec -it <container> bash in order to open a bash in an active container session.
Have you tried restarting your docker? It might need to restart or even reboot the host.
I am running Docker (1.10.2) on Windows. I created a script to echo 'Hello World' on my machine and stored it in C:/Users/username/MountTest. I created a new container and mounted this directory (MountTest) as a data volume. The command I ran to do so is shown below:
docker run -t -i --name mounttest -v /c/Users/sarin/MountTest:/home ubuntu /bin/bash
Next, I run the command to execute the script within the container mounttest.
docker exec -it mounttest sh /home/helloworld.sh
The result is as follows:
: not foundworld.sh: 2: /home/helloworld.sh:
Hello World
I get the desired output (echo Hello World) but I want to understand the reason behind the not found errors.
Note: This question might look similar to Run shell script on docker from shared volume, but it addresses permission related issues.
References:
The helloworld.sh file:
#!/bin/sh
echo 'Hello World'
The mounted volumes information is captured below.
Considering the default ENTRYPOINT for the 'ubuntu' image is sh -c, the final command executed on docker exec is:
sh -c 'sh /home/helloworld.sh'
It looks a bit strange and might be the cause of the error message.
Try simply:
docker exec -it mounttest /home/helloworld.sh
# or
docker exec -it mounttest sh -c '/home/helloworld.sh'
Of course, the docker exec should be done in a boot2docker ssh session, simalar to the shell session in which you did a docker run.
Since the docker run opens a bash, you should make a new boot2docker session (docker-machine ssh), and in that new boot2docker shell session, try the docker exec.
Trying docker exec from within the bash made by docker run means trying to do DiD (Docker in Docker). It is not relevant for your test.