I'm a Docker newbie and have managed to create simple steps to create, start and load an image running sqlserver with a database backup. For me, it's three steps now.
docker pull mcr.microsoft.com/mssql/server:2019-latest
docker run --name SQL19c -p 1433:1433 -e "ACCEPT_EULA=Y" -e "SA_PASSWORD=xxxx" -v /Users/useraccount/sql:/sql -d mcr.microsoft.com/mssql/server:2019-latest
docker exec -it SQL19c /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P 'xxxx' -Q 'RESTORE DATABASE svcodecamp FROM DISK = "/sql/sv-small-2019.bak" WITH MOVE "361684_codecamp08_dat" TO "/var/opt/mssql/ata/codecamp08_dat.mdf", MOVE "361684_codecamp08_log" TO "/var/opt/mssql/data/codecamp08_log.mdf"'
This is on my macbook running OSX which I reboot frequently so I need to do this everytime I need to use SqlServer.
Questions with this:
1) Each time I do this, I have to increment the SQL19c to Sql19d (or next letter of alphabet) because I get error saying name in use. How to re-use same name?
2) If I rm the container, it needs to repull the full image (1gig). I need to just start it and reload the data, not pull the full image
3) Is there a more optimum way to start SqlServer and load the data without using too much of my battery every time I reboot my computer or restart docker?
(notice my backup file is on a docker share so I don't need to recopy that in)
This is because you already have a container with this name. Try to execute the command:
docker container list -a
If you repull the image I think you remove the image NOT the container for remove the container you must run
docker container rm SQL19x
The way is to restart the container, drop database and then restore the database
Run ONCE: This create a SQL19x container
docker pull mcr.microsoft.com/mssql/server:2019-latest
docker run --name SQL19x -p 1433:1433 -e "ACCEPT_EULA=Y" -e "SA_PASSWORD=xxxx" -v /Users/useraccount/sql:/sql -d mcr.microsoft.com/mssql/server:2019-latest
Now each time you restart the machine you must run the command below to start the container and restart the database.
docker container start SQL19x
docker exec -it SQL19x /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P 'xxxx' -Q 'DROP DATABASE svcodecamp'
docker exec -it SQL19x /opt/mssql-tools/bin/sqlcmd -S localhost -U SA -P 'xxxx' -Q 'RESTORE DATABASE svcodecamp FROM DISK = "/sql/sv-small-2019.bak" WITH MOVE "361684_codecamp08_dat" TO "/var/opt/mssql/ata/codecamp08_dat.mdf", MOVE "361684_codecamp08_log" TO "/var/opt/mssql/data/codecamp08_log.mdf"'
If you want to have a clean shutdown before to poweroff your machine execute
docker container stop SQL19x
This question already has answers here:
How should I backup & restore docker named volumes
(4 answers)
Closed 3 years ago.
I have a MS SQLServer 2017 Linux Docker container running with docker-compose. (Working on
a Windows host.)
The server is running, I added data, and this data is persistent across multiple docker-compose up / down
since the server uses a docker volume. The data disappears when I use docker-compose down -v. So this works as intended:
services:
sql:
image: mcr.microsoft.com/mssql/server:2017-GA-ubuntu
volumes:
- sqldata:/var/opt/mssql
...
volumes:
sqldata:
driver: local
name: sqldata
Now I am trying to backup & restore the database. I know the "normal" way, using the SQLServer directly. This works:
# Restore a backup inside the container volume
docker exec -it sql mkdir /var/opt/mssql/backup
docker cp .\Test.bak sql:/var/opt/mssql/backup
sqlcmd -S 127.0.0.1,1433 -U sa -P Secr3tSA_Passw0rd -H 127.0.0.1,1433 -Q "RESTORE DATABASE [Test] FROM DISK='/var/opt/mssql/backup/Test.bak' WITH REPLACE"
# Backup a database inside the container volume, then copy to local file
docker exec sql rm -rf /var/opt/mssql/backup/Test.bak
sqlcmd -S 127.0.0.1,1433 -U sa -P Secr3tSA_Passw0rd -H 127.0.0.1,1433 -Q "BACKUP DATABASE [Test] TO DISK='/var/opt/mssql/backup/Test.bak'"
docker cp sql:/var/opt/mssql/backup/Test.bak .\Test.bak
Now I was thinking, maybe there is a better way than to put the SA password into a BAT file
and hand that out to my customers and service technicians. Simply grabbing a copy of the volume
should do the trick!
I found this:
# Make sure the SQLServer is not writing/blocking any files.
docker-compose stop sql
# Backup & Restore the sqldata volume.
docker run --rm -v sqldata -v $pwd\backup:/backup ubuntu bash -c "cd /whsqldata && tar xvf /backup/backup.tar --strip 1"
docker run --rm -v sqldata -v $pwd\backup:/backup ubuntu bash -c "cd /whsqldata && tar cvf /backup/backup.tar ."
# Restart the SQLServer.
docker-compose start sql
This creates the expected backup.tar in my user directory... But it is suspiciously small! And after the
restore, the SQLServer cannot connect to the database. It looks like the backup.tar has no content.
But on closer inspection, so has my sqldata volume! It is empty!? When I start a bash that mounts that
same volume, I can see the directory but there is nothing in it:
docker run --rm -v sqldata -it ubuntu
/ # ls sqldata/ -a
. ..
/ #
The SQLServer´s data persists. So it´s got to be saved somewhere, right? What am I missing?!
OK, after reading the answers to How should I backup & restore docker named volumes I found out that my mistake was in how I mounted the volume. Instead of -v sqldata I have to write -v sqldata:/sqldata. Also changed some paths in my commands.
The completed commands are:
# Backup the data volume
docker run --rm \
-v sqldata:/sqldata \
-v $pwd\:/backup \
ubuntu tar cvf /backup/backup.tar /sqldata
# Remove existing data volume (clear up old data, if exists)
docker volume rm sqldata
# Restore the data volume
docker run --rm \
-v sqldata:/sqldata \
-v $pwd\:/backup \
ubuntu tar xvf /backup/backup.tar -C sqldata --strip 1
First, I follow the postgresql instruction on docker:
docker run --name test-postgres
then i tried to restore my db by the following command:
xz -dc matrix-ww.sql.xz | docker exec -i test-postgres psql -U postgres matrix --set ON_ERROR_STOP=on --single-transaction
the command seems executed. however, when i check the database and its tables, the database is still empty.
I'm working with docker to test a web application, and this application needs a database. I copied my application in a tomcat container and created a mssql container.
However, I need to copy my mssql database located in a server called "tstsupsq" with all datas (not only the schema) in my mssql container.
PS : I don't have access to mdf files of the tstsupsq server
Do someone can help me ?
Thanks
EDIT :
After many tries, I fixed this issue with command lines.
How to copy mssql database from any server to docker with command lines :
sqlcmd.exe -S myServer -U myUser -P myPassword -Q "BACKUP DATABASE [databaseName] TO DISK='backupLocation\databaseName.bak'"
docker run -d -p 1433:1433 -e ACCEPT_EULA=Y -e SA_PASSWORD=myPassword --name containerName microsoft/mssql-server-linux:latest
docker cp backupLocation\databaseName.bak containerName:/var/opt/mssql/data
docker exec -it containerName /opt/mssql-tools/bin/sqlcmd -S localhost -U sa -P myPassword -Q "RESTORE DATABASE [databaseName] FROM DISK='/var/opt/mssql/data\databaseName.bak' WITH MOVE 'databaseName' TO '/var/opt/mssql/data/databaseName.mdf', MOVE 'databaseName_Log' TO '/var/opt/mssql/data/databaseName.ldf'"
Your database is now avaible with all its datas in your docker container.
Use cp command to copy your bak file to container
docker cp YourDbBackup.bak YourContainer:/YourDbBackup.bak
Then use SSMS to restore bak file.
I'm trying to backup/restore a PostgreSQL database as is explained on the Docker website, but the data is not restored.
The volumes used by the database image are:
VOLUME ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"]
and the CMD is:
CMD ["/usr/lib/postgresql/9.3/bin/postgres", "-D", "/var/lib/postgresql/9.3/main", "-c", "config_file=/etc/postgresql/9.3/main/postgresql.conf"]
I create the DB container with this command:
docker run -it --name "$DB_CONTAINER_NAME" -d "$DB_IMAGE_NAME"
Then I connect another container to insert some data manually:
docker run -it --rm --link "$DB_CONTAINER_NAME":db "$DB_IMAGE_NAME" sh -c 'exec bash'
psql -d test -h $DB_PORT_5432_TCP_ADDR
# insert some data in the db
<CTRL-D>
<CTRL-D>
The tar archive is then created:
$ sudo docker run --volumes-from "$DB_CONTAINER_NAME" --rm -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /etc/postgresql /var/log/postgresql /var/lib/postgresql
Now I remove the container used for the db and create another one, with the same name, and try to restore the data inserted before:
$ sudo docker run --volumes-from "$DB_CONTAINER_NAME" --rm -v $(pwd):/backup ubuntu tar xvf /backup/backup.tar
But the tables are empty, why is the data not properly restored ?
Backup your databases
docker exec -t your-db-container pg_dumpall -c -U postgres > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql
Restore your databases
cat your_dump.sql | docker exec -i your-db-container psql -U postgres
Backup Database
generate sql:
docker exec -t your-db-container pg_dumpall -c -U your-db-user > dump_$(date +%Y-%m-%d_%H_%M_%S).sql
to reduce the size of the sql you can generate a compress:
docker exec -t your-db-container pg_dumpall -c -U your-db-user | gzip > ./dump_$(date +"%Y-%m-%d_%H_%M_%S").gz
Restore Database
cat your_dump.sql | docker exec -i your-db-container psql -U your-db-user -d your-db-name
to restore a compressed sql:
gunzip < your_dump.sql.gz | docker exec -i your-db-container psql -U your-db-user -d your-db-name
PD: this is a compilation of what worked for me, and what I got from here and elsewhere. I am beginning to make contributions, any feedback will be appreciated.
I think you can also use a postgres backup container which would backup your databases within a given time duration.
pgbackups:
container_name: Backup
image: prodrigestivill/postgres-backup-local
restart: always
volumes:
- ./backup:/backups
links:
- db:db
depends_on:
- db
environment:
- POSTGRES_HOST=db
- POSTGRES_DB=${DB_NAME}
- POSTGRES_USER=${DB_USER}
- POSTGRES_PASSWORD=${DB_PASSWORD}
- POSTGRES_EXTRA_OPTS=-Z9 --schema=public --blobs
- SCHEDULE=#every 0h30m00s
- BACKUP_KEEP_DAYS=7
- BACKUP_KEEP_WEEKS=4
- BACKUP_KEEP_MONTHS=6
- HEALTHCHECK_PORT=81
cat db.dump | docker exec ... way didn't work for my dump (~2Gb). It took few hours and ended up with out-of-memory error.
Instead, I cp'ed dump into container and pg_restore'ed it from within.
Assuming that container id is CONTAINER_ID and db name is DB_NAME:
# copy dump into container
docker cp local/path/to/db.dump CONTAINER_ID:/db.dump
# shell into container
docker exec -it CONTAINER_ID bash
# restore it from within
pg_restore -U postgres -d DB_NAME --no-owner -1 /db.dump
Okay, I've figured this out. Postgresql does not detect changes to the folder /var/lib/postgresql once it's launched, at least not the kind of changes I want it do detect.
The first solution is to start a container with bash instead of starting the postgres server directly, restore the data, and then start the server manually.
The second solution is to use a data container. I didn't get the point of it before, now I do.
This data container allows to restore the data before starting the postgres container. Thus, when the postgres server starts, the data are already there.
The below command can be used to take dump from docker postgress container
docker exec -t <postgres-container-name> pg_dump --no-owner -U <db-username> <db-name> > file-name-to-backup-to.sql
The top answer didn't work for me. I kept getting this error:
psql: error: FATAL: Peer authentication failed for user "postgres"
To get it to work I had to specify a user for the docker container:
Backup
docker exec -t --user postgres your-db-container pg_dumpall -c -U postgres > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql
Restore
cat your_dump.sql | docker exec -i --user postgres your-db-container psql -U postgres
Another approach (based on docker-postgresql-workflow)
Local running database (not in docker, but same approach would work) to export:
pg_dump -F c -h localhost mydb -U postgres export.dmp
Container database to import:
docker run -d -v /local/path/to/postgres:/var/lib/postgresql/data postgres #ex runs container as `CONTAINERNAME` #find via `docker ps`
docker run -it --link CONTAINERNAME:postgres --volume $PWD/:/tmp/ postgres bash -c 'exec pg_restore -h postgres -U postgres -d mydb -F c /tmp/sonar.dmp'
I had this issue while trying to use a db_dump to restore a db. I normally use dbeaver to restore- however received a psql dump, so had to figure out a method to restore using the docker container.
The methodology recommended by Forth and edited by Soviut worked for me:
cat your_dump.sql | docker exec -i your-db-container psql -U postgres -d dbname
(since this was a single db dump and not multiple db's i included the name)
However, in order to get this to work, I had to also go into the virtualenv that the docker container and project were in. This eluded me for a bit before figuring it out- as I was receiving the following docker error.
read unix #->/var/run/docker.sock: read: connection reset by peer
This can be caused by the file /var/lib/docker/network/files/local-kv.db .I don't know the accuracy of this statement: but I believe I was seeing this as I do not user docker locally, so therefore did not have this file, which it was looking for, using Forth's answer.
I then navigated to correct directory (with the project) activated the virtualenv and then ran the accepted answer. Boom, worked like a top. Hope this helps someone else out there!
dksnap (https://github.com/kelda/dksnap) automates the process of running pg_dumpall and loading the dump via /docker-entrypoint-initdb.d.
It shows you a list of running containers, and you pick which one you want to backup. The resulting artifact is a regular Docker image, so you can then docker run it, or share it by pushing it to a Docker registry.
(disclaimer: I'm a maintainer on the project)
This is the command worked for me.
cat your_dump.sql | sudo docker exec -i {docker-postgres-container} psql -U {user} -d {database_name}
for example
cat table_backup.sql | docker exec -i 03b366004090 psql -U postgres -d postgres
Reference: Solution given by GMartinez-Sisti in this discussion.
https://gist.github.com/gilyes/525cc0f471aafae18c3857c27519fc4b
Solution for docker-compose users:
At First run the docker-compose file by any on of following commands: $ docker-compose -f loca.yml up OR docker-compose -f loca.yml up -d
For taking backup: $ docker-compose -f local.yml exec postgres backup
To see list of backups inside container: $ docker-compose -f local.yml exec postgres backups
Open another terminal and run following command: $ docker ps
Look for the CONTAINER ID of postgres image and copy the ID. Let's assume the CONTAINER ID is: ba78c0f9bcee
Now to bring that backup into your local file system, run the following command: $ docker cp ba78c0f9bcee:/backups ./local_backupfolder
Hope this will help someone who was lost just like me..
N.B: The full details of this solution can be found here.
Another way to do it is to run the pg_restore (of course if you have postgres set up in your host machine) command from the host machine.
Assuming that you have port mapping "5436:5432" for the postgres service in your docker-compose file. Having this port mapping will let you access the container's postgres (running on port 5432) via your host machine's port 5436
pg_restore -h localhost -p 5436 -U <POSTGRES_USER> -d <POSTGRES_DB> /Path/to/the/.psql/file/in/your/host_machine
This way you do not have to dive into the container's terminal or copy the dump file to the container.
I would like to add the official docker documentation for backups and restores. This applies to all kinds of data within a volume, not just postegres.
Backup a container
Create a new container named dbstore:
$ docker run -v /dbdata --name dbstore ubuntu /bin/bash
Then in the next command, we:
Launch a new container and mount the volume from the dbstore container
Mount a local host directory as /backup
Pass a command that tars the contents of the dbdata volume to a backup.tar file inside our /backup directory.
$ docker run --rm --volumes-from dbstore -v $(pwd):/backup ubuntu tar cvf /backup/backup.tar /dbdata
When the command completes and the container stops, we are left with a backup of our dbdata volume.
Restore container from backup
With the backup just created, you can restore it to the same container, or another that you made elsewhere.
For example, create a new container named dbstore2:
$ docker run -v /dbdata --name dbstore2 ubuntu /bin/bash
Then un-tar the backup file in the new container`s data volume:
$ docker run --rm --volumes-from dbstore2 -v $(pwd):/backup ubuntu bash -c "cd /dbdata && tar xvf /backup/backup.tar --strip 1"
You can use the techniques above to automate backup, migration and restore testing using your preferred tools.
Using a File System Level Backup on Docker Volumes
Example Docker Compose
version: "3.9"
services:
db:
container_name: pg_container
image: platerecognizer/parkpow-postgres
# restart: always
volumes:
- postgres_data:/var/lib/postgresql/data/
environment:
POSTGRES_USER: admin
POSTGRES_PASSWORD: admin
POSTGRES_DB: admin
volumes:
postgres_data:
Backup Postgresql Volume
docker run --rm \
--user root \
--volumes-from pg_container \
-v /tmp/db-bkp:/backup \
ubuntu tar cvf /backup/db.tar /var/lib/postgresql/data
Then copy /tmp/db-bkp to second host
Restore Postgresql Volume
docker run --rm \
--user root \
--volumes-from pg_container \
-v /tmp/db-bkp:/backup \
ubuntu bash -c "cd /var && tar xvf /backup/db.tar --strip 1"