Re-add Kubelet metadata service dependency on DigitalOcean

* Restore the original special-casing of DigitalOcean Kubelets
* Fix node metadata InternalIP being set to the IP of the default
gateway on DigitalOcean nodes (regressed in v1.12.3)
* Reverts the "pretty" node names on DigitalOcean (worker-2 vs IP)
* Closes #424 (full details)

digital-ocean/container-linux/kubernetes/cl/controller.yaml.tmpl

@@ -56,9 +56,12 @@ systemd:
       contents: |
         [Unit]
         Description=Kubelet via Hyperkube
+        Requires=coreos-metadata.service
+        After=coreos-metadata.service
         Wants=rpc-statd.service
         [Service]
         EnvironmentFile=/etc/kubernetes/kubelet.env
+        EnvironmentFile=/run/metadata/coreos
         Environment="RKT_RUN_ARGS=--uuid-file-save=/var/cache/kubelet-pod.uuid \
           --volume=resolv,kind=host,source=/etc/resolv.conf \
           --mount volume=resolv,target=/etc/resolv.conf \
@@ -90,6 +93,7 @@ systemd:
           --cluster_domain=${cluster_domain_suffix} \
           --cni-conf-dir=/etc/kubernetes/cni/net.d \
           --exit-on-lock-contention \
+          --hostname-override=$${COREOS_DIGITALOCEAN_IPV4_PRIVATE_0} \
           --kubeconfig=/etc/kubernetes/kubeconfig \
           --lock-file=/var/run/lock/kubelet.lock \
           --network-plugin=cni \

digital-ocean/container-linux/kubernetes/cl/worker.yaml.tmpl

@@ -31,9 +31,12 @@ systemd:
       contents: |
         [Unit]
         Description=Kubelet via Hyperkube
+        Requires=coreos-metadata.service
+        After=coreos-metadata.service
         Wants=rpc-statd.service
         [Service]
         EnvironmentFile=/etc/kubernetes/kubelet.env
+        EnvironmentFile=/run/metadata/coreos
         Environment="RKT_RUN_ARGS=--uuid-file-save=/var/cache/kubelet-pod.uuid \
           --volume=resolv,kind=host,source=/etc/resolv.conf \
           --mount volume=resolv,target=/etc/resolv.conf \
@@ -63,6 +66,7 @@ systemd:
           --cluster_domain=${cluster_domain_suffix} \
           --cni-conf-dir=/etc/kubernetes/cni/net.d \
           --exit-on-lock-contention \
+          --hostname-override=$${COREOS_DIGITALOCEAN_IPV4_PRIVATE_0} \
           --kubeconfig=/etc/kubernetes/kubeconfig \
           --lock-file=/var/run/lock/kubelet.lock \
           --network-plugin=cni \

digital-ocean/fedora-atomic/kubernetes/cloudinit/controller.yaml.tmpl

@@ -19,9 +19,24 @@ write_files:
       ETCD_PEER_CERT_FILE=/etc/ssl/certs/etcd/peer.crt
       ETCD_PEER_KEY_FILE=/etc/ssl/certs/etcd/peer.key
       ETCD_PEER_CLIENT_CERT_AUTH=true
+  - path: /etc/systemd/system/cloud-metadata.service
+    content: |
+      [Unit]
+      Description=Cloud metadata agent
+      [Service]
+      Type=oneshot
+      Environment=OUTPUT=/run/metadata/cloud
+      ExecStart=/usr/bin/mkdir -p /run/metadata
+      ExecStart=/usr/bin/bash -c 'echo "HOSTNAME_OVERRIDE=$(curl\
+        --url http://169.254.169.254/metadata/v1/interfaces/private/0/ipv4/address\
+        --retry 10)" > $${OUTPUT}'
+      [Install]
+      WantedBy=multi-user.target
   - path: /etc/systemd/system/kubelet.service.d/10-typhoon.conf
     content: |
       [Unit]
+      Requires=cloud-metadata.service
+      After=cloud-metadata.service
       Wants=rpc-statd.service
       [Service]
       ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -79,6 +94,7 @@ runcmd:
   - "atomic install --system --name=kubelet quay.io/poseidon/kubelet:v1.13.4"
   - "atomic install --system --name=bootkube quay.io/poseidon/bootkube:v0.14.0"
   - [systemctl, start, --no-block, etcd.service]
+  - [systemctl, enable, cloud-metadata.service]
   - [systemctl, enable, kubelet.path]
   - [systemctl, start, --no-block, kubelet.path]
 users:

digital-ocean/fedora-atomic/kubernetes/cloudinit/worker.yaml.tmpl

@@ -1,8 +1,23 @@
 #cloud-config
 write_files:
+  - path: /etc/systemd/system/cloud-metadata.service
+    content: |
+      [Unit]
+      Description=Cloud metadata agent
+      [Service]
+      Type=oneshot
+      Environment=OUTPUT=/run/metadata/cloud
+      ExecStart=/usr/bin/mkdir -p /run/metadata
+      ExecStart=/usr/bin/bash -c 'echo "HOSTNAME_OVERRIDE=$(curl\
+        --url http://169.254.169.254/metadata/v1/interfaces/private/0/ipv4/address\
+        --retry 10)" > $${OUTPUT}'
+      [Install]
+      WantedBy=multi-user.target
   - path: /etc/systemd/system/kubelet.service.d/10-typhoon.conf
     content: |
       [Unit]
+      Requires=cloud-metadata.service
+      After=cloud-metadata.service
       Wants=rpc-statd.service
       [Service]
       ExecStartPre=/bin/mkdir -p /opt/cni/bin
@@ -51,6 +66,7 @@ bootcmd:
   - [modprobe, ip_vs]
 runcmd:
   - [systemctl, daemon-reload]
+  - [systemctl, enable, cloud-metadata.service]
   - "atomic install --system --name=kubelet quay.io/poseidon/kubelet:v1.13.4"
   - [systemctl, enable, kubelet.path]
   - [systemctl, start, --no-block, kubelet.path]