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specify labels unique to a process type #6

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specify labels unique to a process type #6

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11 changes: 11 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,17 @@ Test http://myendpoint.com.

For more information on setting up backplane see `backplane help`.

### Multiple web server process types

In order to route traffic to the correct dynos you can apply unique labels to a process type
by using the `BACKPLANE_LABELS_<proc>` environment variable. Only the backplane agents running
on dynos for the `<proc>` process type will apply these labels. Note: the labels from
`BACKPLANE_LABELS` will also be applied universally across all whitelisted process types.

Example:

$ heroku config:set BACKPLANE_LABELS_externalweb="endpoint=external.myendpoint.com"

## Known Issues

### Fetch Error
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10 changes: 10 additions & 0 deletions bin/compile
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Expand Up @@ -18,8 +18,18 @@ install_backplane() {

install_backplane

echo "-----> Backplane Agent sources labels from the enviroment varaible BACKPLANE_LABELS by default."
echo " Add unique labels for each process listed in the Procfile using BACKPLANE_LABELS_<proc>."
echo " Example: BACKPLANE_LABELS_web=\"endpoint=www.mydomain.com\""

echo "-----> Writing .profile.d/backplane.sh"
cat <<-EOF > $build/.profile.d/backplane.sh
CURRENT_PROCESS_TYPE=\${DYNO%.*}
BACKPLANE_LABELS_proc=BACKPLANE_LABELS_\${CURRENT_PROCESS_TYPE}
if [ -n \${!BACKPLANE_LABELS_proc+x} ]; then
BACKPLANE_LABELS="\$BACKPLANE_LABELS, \${!BACKPLANE_LABELS_proc}"
fi

BACKPLANE_LABELS="\$BACKPLANE_LABELS, heroku=true"
\$HOME/bin/backplane connect "\$BACKPLANE_LABELS" http://127.0.0.1:\$PORT &
EOF