gitLab CI: cache the latest floating IP to improve robustness

.gitlab-ci.yml

@@ -44,12 +44,14 @@ test-single:
     - touch ./secure.yml
     # better to init terraform before allocating public floating IP address (the state could be locked)
     - terraform init -input=false
-    - ip=`openstack floating ip create -c floating_ip_address -f value public-muni-147-251-21-GROUP`
+    - if test -f ip.txt; then ip=$(cat ip.txt); openstack floating ip show "$ip" >/dev/null || ip=''; fi
+    - if test -z "$ip"; then ip=$(openstack floating ip create -c floating_ip_address -f value public-muni-147-251-21-GROUP); echo "$ip" > ip.txt; fi
   cache:
     when: always
     key: single
     paths:
       - ".terraform/"
+      - "ip.txt"
   script:
     - args="-auto-approve -var type=hadoop-single -var flavor=standard.large -var n=0 -var domain=terra1 -var image_name=$IMAGE_NAME -var image_visibility=$IMAGE_VISIBILITY -var floating_ip=$ip"
     - terraform apply $args
@@ -58,6 +60,7 @@ test-single:
     - ssh -o PreferredAuthentications=publickey deployadm@$ip "sudo -u debian sh -c 'cd; ~deployadm/terraform/image/tests/run-tests.sh'"
     - terraform destroy $args
     - openstack floating ip delete $ip
+    - rm -fv ip.txt
   rules:
     - if: '$JOB =~ /all|test-single/'
   artifacts: &artifacts
@@ -73,6 +76,7 @@ test-cluster:
     key: cluster
     paths:
       - ".terraform/"
+      - "ip.txt"
   script:
     - args="-auto-approve -var type=hadoop -var domain=terra2 -var image_name=$IMAGE_NAME -var image_visibility=$IMAGE_VISIBILITY -var floating_ip=$ip"
     - terraform apply $args
@@ -81,6 +85,7 @@ test-cluster:
     - ssh -o PreferredAuthentications=publickey deployadm@$ip "sudo -u debian sh -c 'cd; ~deployadm/terraform/image/tests/run-tests.sh'"
     - terraform destroy $args
     - openstack floating ip delete $ip
+    - rm -fv ip.txt
   rules:
     - if: '$JOB =~ /all|test-cluster/'
   artifacts: *artifacts