DRBD Watcher is a small program that will watch /proc/drbd and invoke another program whenver /proc/drbd changes.
sudo snap install go --classic
GOPATH=${GOPATH:-$HOME}
GOBIN=${GOBIN:-$GOPATH/bin}
mkdir -p $GOPATH/src/github.com/muir
cd $GOPATH/src/github.com/muir
git clone https://github.com/muir/drbd-watcher.git
cd drbd-watcher
/snap/bin/go install ./...
sudo cp $GOBIN/drbd-watcher /usr/local/bin/The watcher isn't much use without a program to invoke upon change.
The program will be executed with the following arguments in addition to whatever is specified when invoking the watcher:
resource (eg "r0")
connection state (eg "WFConnection")
role, self (eg "Secondary")
role, remote (eg "Unknown")
disk state, self (eg "UpToDate")
disk state, remote (eg "UpToDate")
mount point (eg "/my-shared-disk", if kwown)
In addition the following environment variables will be set:
OLD_CONNECTED_STATE="WFConnection" # prior connection status"
OLD_SELF_ROLE="Primary" # prior self role
OLD_REMOTE_ROLE="Unknown" # prior remote role
OLD_SELF_DISK="Secondary" # prior self disk state
OLD_REMOTE_DISK="DUnknown" # prior remote disk sate
ALL_MOUNTS="/my/file/system" # all filesystems, mounted or not that mount on /dev/drbd0
STABLE_SECONDS="9999" # seconds since last change in this resource state
If writing a shell script, a reasonable start is:
#!/bin/bash
resource=$1
connection=$2
self_role=$3
remote_role=$4
self_disk=$5
remote_disk=$6
filesystem=$7