Re: pg_base_backup limit bandwidth possible?

At the end, I've chosen to use the following:

trickle -u 500 -d 500 rsync --progress --partial -az ${PGDATA}/* root@xxx.bbbbbb.com:/var/lib/pgsql/repl-9.3/data/ --exclude postmaster.pid --exclude postgresql.conf --exclude pg_hba.conf --exclude pg_log

and it worked really well. This way I've limited bandwidth consumption to 10Mbps.


Atenciosamente,

Edson Richter

The way I’ve solved the problem before 9.4 is to use a command called 'pv' (pipe view).  Normally this command is useful for seeing the rate of data flow in a pipe, but it also does have a rate limiting capacity.  The trick for me was running the output of pg_basebackup through pv (emulates having a slow disk) without having to have double the storage when building a new slave.

First, 'pg_basebackup' to standard out in the tar format.  Then pipe that to 'pv' to quietly do rate limiting.  Then pipe that to 'tar' to lay it out in a directory format.  Tar will dump everything into the current directory, but transform will give you the effect of having selected a directory in the initial command.

The finished product looks something like:

pg_basebackup -U postgres -D - -F t -x -vP | pv -q --rate-limit 100m | tar -xf - --transform='s`^`./pgsql-data-backup/`'