I am using postgresql on an embedded device running yocto (customized linux). The package containing postgresql does not provide psql or pg_restore. /usr/bin provides the following tools:
pg_basebackup indicates that I am able to create backups. But how am I supposed to restore a backup within a terminal? With pg_restore or psql this would not be a problem for me.
Please note: I want to use a backup created on my windows/linux computer to create the initial database on the embedded device.
Create backup of the db using command:
pg_basebackup -h {host_ip} -D pg_backup -U {USER}
for restoring just change the data folder to pg_backup. Now start the psql server.
Related
I have an existing application that I am trying to port over to Dokku, and part of that is getting the existing data store copied over. I am using the Dokku Postgres plugin, but am having trouble getting the database ported over.
In my existing app I am creating a dump of the database:
// Create dump file
pg_dump app_database > db.dump
// Copy over to server hosting Dokku app
scp db.dump sshdetails
// SSH into new server, then attempt to import dump file
dokku postgres:import db < db.dump
When I run the last command, I get the message:
pg_restore: error: input file appears to be a text format dump. Please use psql.
I have tried formatting the dump in a few different formats but no luck. Any advice would be greatly appreciated. Thanks
From the source of dokku postgres:export command in dokku-postgres plugin :
docker exec "$SERVICE_NAME" env PGPASSWORD="$PASSWORD" pg_dump -Fc --no-acl --no-owner -h localhost -U postgres -w "$DATABASE_NAME"
The dokku postgres:export command have -Fc argument for pg_dump which export dump as archive suitable for input into pg_restore (more information into pg_dump man page) and pg_restore command seems to only accept custom format from pg_dump (cf. pg_restore man), so you should use the same -Fc argument in pg_dump command.
I want to take a DB dump from a remote server and then copy this dump to my local.
I tried couple of commands but didn't worked.
Lastly I tried the command below;
pg_dump -h 10.10.10.70 -p 5432 -U postgres -d mydb | gzip > db1.gz
I succesffully take the DB and tried with restore from Pgadmin, it gives;
pg_restore: error: input file appears to be a text format dump. Please use psql
But at this point I can't use psql, I have to use Pgadmin and not sure if I'm able to get successfully DB dump to my local. I mean I can't verify with restore.
How can I take DB dump from remote server to my local?
Thanks!
Use the "custom" format:
pg_dump -F c -h 10.10.10.70 -p 5432 -U postgres -f mydb.dmp mydb
That can be restores with pg_restore and hence with pgAdmin.
You do not have to use pgAdmin. pgAdmin uses pg_restore, and there is nothing that keeps you from using it too.
i'm trying to restore a pg_dump with pgAdmin 4.
this is the command i've used to create the backup pg_dump -U {dbUser} -h localhost -Fc {dbName} > {backupFolder}/{backupName}, but when i try to restore it using pgAdmin i get this:
If i execute the command pg_restore manually i get this error
pg_restore: error: could not read from input file: end of file
I've created the dump on a linux machine and trying to restore it with pgAdmin from a windows machine to the linux machine
any help? thanks!
The problem was actually the ftp method i was using to transfer the dump... The file was a bit bigger after the ftp transfer, fixing the ftp transfer have solved the problem!
Can anyone help me out how to backup and restore a specific database instance if I have multiple PostgreSQL instances running on a single server?
For example, I have db1, db2 and db3 on a single server. How do I backup db1 and restore it without affecting db2 and db3?
Here's how I restart the instances separately.
/usr/pgsql-9.6/bin/pg_ctl restart -D /var/lib/pgsql/9.6/db1
/usr/pgsql-9.6/bin/pg_ctl restart -D /var/lib/pgsql/9.6/db2
/usr/pgsql-9.6/bin/pg_ctl restart -D /var/lib/pgsql/9.6/db3
Thank you, #FatFreddy.
I was able to backup and restore a specific database instance on a server having multiple PostgreSQL instances using the following commands:
Backup: pg_dumpall -p 5435 > /var/lib/pgsql/9.6/db1/PostgreSQL_db1_{date}.sql
Restore: psql -U postgres -p 5435 -f /var/lib/pgsql/9.6/db1/PostgreSQL_db1_{date}.sql
I have a database server without much disk space, so I took a backup of the entire db (let's just call it redblue) and saved it locally using the following command (I don't have pg running on my computer):
ssh admin#w.x.y.z "pg_dump -U postgres redblue -h localhost " \
>> db_backup_redblue.sql
I'd like to now restore it to another server (1.2.3.4) which contains an older version of "redblue" database - however wanted to ask if this is right before I try it:
ssh admin#1.2.3.4 "pg_restore -U postgres -C redblue" \
<< db_backup_redblue.sql
I wasn't sure if I need to do -C with the name of the db or not?
Will the above command overwrite/restore the remote database with the file I have locally?
Thanks!
No, that will do nothing good.
You have to start pg_restore on the machine where the dump is. Actually, since this is a plain format dump, you have to use psql rather than pg_restore:
psql -h 1.2.3.4 -U postgres -d redblue -f db_backup_redblue.sql
That requires that there is already an empty database redblue on the target system.
If you want to replace an existing database, you have to use the --clean and --create options with pg_dump.
If you want to use SSL, you'll have to configure the PostgreSQL server to accept SSL connections, see the documentation.
I'd recommend the “custom” format of pg_dump.
Of course, you can do this :) Assuming you use ssh keys to authorize user from source host to destination host.
On the source host you do the pg_dump, then pipe through ssh to destination host like this:
pg_dump -C nextcloud | ssh -i .ssh/pg_nextcloud_key postgres#192.168.0.54 psql -d template1
Hope that helps ;)