add node-exporter

Author: Anandkumar Patel

lib/container.sh

@@ -101,11 +101,39 @@ container::_start_cadvisor_container() {
   fi
 }
 
+container::_start_node_exporter_container() {
+  local name="prom/node-exporter"
+  local version="0.12.0"
+
+  log::info "Starting ${name}:${version} container"
+  local docker_logs
+  docker_logs=$(docker run \
+    --name=node-exporter \
+    --detach=true \
+    --restart=always \
+    --net=host
+    --publish=29006:9100 \
+    --memory=100mb \
+    --memory-reservation=50mb \
+    "${name}:${version}")
+
+  if [[ "$?" -gt "0" ]]; then
+    local data='{"version":'"${version}"', "output":'"${docker_logs}"'}'
+    rollbar::report_error \
+      "Dock-Init: Cannot Run ${name} Container" \
+      "Starting ${name} Container is failing." \
+      "${data}"
+    return 1
+  fi
+}
+
 # Starts all container services needed for the dock
 container::start() {
   log::info "Starting container services"
   backoff container::_start_registry_container
   backoff container::_start_cadvisor_container
+  backoff container::_start_node_exporter_container
+
   # swarm should be started last so we know everything is up
   backoff container::_start_swarm_container
 }

test/container.sh

@@ -109,19 +109,48 @@ describe 'container.sh'
     rollbar::report_error::restore
   end # end container::_start_cadvisor_container
 
+  describe 'container::_start_node_exporter_container'
+    local cadvisor_version='v0.24.1'
+    stub docker
+    stub rollbar::report_error
+
+    it 'should run docker container'
+      container::_start_node_exporter_container
+      docker::called
+    end
+
+    it 'should report errors on failure'
+      docker::errors
+      container::_start_node_exporter_container
+      rollbar::report_error::called
+    end
+
+    it 'should return 1 on failure'
+      docker::errors
+      container::_start_node_exporter_container
+      assert equal "$?" "1"
+    end
+
+    docker::restore
+    rollbar::report_error::restore
+  end # end container::_start_node_exporter_container
+
   describe 'container::start'
     stub container::_start_registry_container
     stub container::_start_cadvisor_container
+    stub container::_start_node_exporter_container
     stub container::_start_swarm_container
 
     it 'should start all required containers'
     container::start
     container::_start_registry_container::called
     container::_start_cadvisor_container::called
+    container::_start_node_exporter_container::called
     container::_start_swarm_container::called
 
     container::_start_registry_container::restore
     container::_start_cadvisor_container::restore
+    container::_start_node_exporter_container::restore
     container::_start_swarm_container::restore
   end # end container::start
 end # container.sh