Our recipe for rebuilding all the production scihist_digicoll servers from scratch.

1. Build

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If there’s no rush, consider performing the build and switch phases on consecutive days.

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Setup

Just some shell substitutions to help avoid typos and make the commands easier to read.

PRIVATE_KEY="~/.ssh/chf_prod.pem"
PASS_FILE="~/.ansible_password.txt"
SECURITY_OPTS="--vault-password-file

...

$PASS_FILE --private-key

...

=$PRIVATE_KEY"
CREATE_CMD="ansible-playbook create_kithe.yml”

DB
$CREATE_CMD $SECURITY_OPTS --extra-vars "role=database tier=production"

Add DB’s private IP to group_vars/kithe_production

redis_ip: new_private_ip_of_scihist_digicoll-database1-production
postgres_ip: new_private_ip_of_scihist_digicoll-database1-production

SOLR

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$CREATE_CMD $SECURITY_OPTS --extra-vars "role=solr tier=production"

Add SOLR’s private IP to group_vars/kithe_production

solr_ip: new_private_ip_of_scihist_digicoll-solr1-production

Jobs

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$CREATE_CMD $SECURITY_OPTS --extra-vars "role=jobs tier=production"

Web

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$CREATE_CMD $SECURITY_OPTS --extra-vars "role=web tier=production" --extra-vars "@group_vars/group_vars/kithe_web_production_override"

Deploy

Deploy master branch to all servers.

bundle exec cap production deploy --trace

At this stage, if you point the prod URL in your etc/hosts file locally to the web server, you should see an empty production website.

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• Point the prod URL in your etc/hosts file locally to the web server.

• Spin up the downtime server in Amazon (actions ➡ instance state ➡ start)

• Point the elastic IP for the prod web server to the downtime server

  • Select Elastic IPs

  • Select Temp-Down

  • Actions ➡ Associate address

  • Under the "Resource type", Choose "Instance".

  • Fill in the appropriate instance (the new prod web server)

  • Check Allow this Elastic IP address to be reassociated if already attached"

• Spin down the existing prod servers (actions ➡ instance state ➡ stop)

• Copy the old database over to the new DB server.:

• Index

  • bundle exec cap production invoke:rake TASK="scihist:solr:reindex"

• Point elastic IP to the new web server:

  • Select "Elastic IPs"

  • Select "digicoll-production"

  • Actions -> ➡ Associate address

  • Under the "Resource type", Choose "Instance".

  • Fill in the appropriate instance (the new prod web server)

  • Check " Allow this Elastic IP address to be reassociated if already attached"

  • Click "Associate".

• Remove the etc/hosts entry and check that traffic is indeed routed to the new server

• Announce the switch is complete.

3. Wrap up

• Wait a couple days

• Turn off termination protection

• Delete the old servers in AWS console

• Delete the old disks left orphaned by the old servers