The idea is to setup mirrors of this wiki across dn42, using anycast to provide redundancy and load-balancing. The local webserver is monitored with a simple shell script (below) working in conjuction with ExaBGP, announcing/withdrawing the assigned route if the service is up/down.

Checklist:

  • Install gollum.

  • Clone the dn42 wiki repo:

    git clone ssh://[email protected]/dn42/wiki /home/wiki.dn42/

  • Generate a CSR and send to [email protected]. Wait for a reply containing internal.dn42/wiki.dn42 certificates.

  • Start two gollum instances, read-only and editing on 127.0.0.1:

    ``` gollum –css /home/wiki.dn42/custom.css –gollum-path /home/wiki.dn42/public_html/ –host 127.0.0.1 –port 4568 –no-edit 

    

#####gollum-watchdog.sh:
    #!/bin/bash

URL=( "http://172.23.0.80" "https://172.23.0.80" )

VALIDATE_KEYWORD='gollum' ROUTE='172.23.0.80/28' NEXTHOP='172.22.177.72'

INTERVAL=60

###########################

RUN_STATE=0

check_urls() { for url in "${URL[@]}"; do curl –insecure -L -o - ${url} | egrep -q "${VALIDATE_KEYWORD}" || { return 1 } done return 0 }

while [ 1 ]; do if [ ${RUN_STATE} -eq 0 ]; then check_urls && { RUN_STATE=1 echo "announce route ${ROUTE} next-hop ${NEXTHOP}" } else check_urls || { RUN_STATE=0 echo "withdraw route ${ROUTE} next-hop ${NEXTHOP}" } fi

sleep ${INTERVAL}

done

exit 0

```