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Exercise 11.2: Ingress Controller - getting error 503 Service Temporarily Unavailable

bdkdavid
bdkdavid Posts: 32
edited May 2022 in LFS258 Class Forum

Step 10:
curl -H "Host: www.external.com" http://10.97.232.130
output

503 Service Temporarily Unavailable

503 Service Temporarily Unavailable

nginx


Expected Output
<!DOCTYPE html>


Welcome to nginx!

<

style>

I am not sure what the problem is the

kubectl get pods |grep ingress
myingress-ingress-nginx-controller-gmzmv 1/1 Running 0 33m
myingress-ingress-nginx-controller-q5jjk 1/1 Running 0 33m
myingress-ingress-nginx-controller-xxcq5 0/1 Evicted 0 69s

Not sure why I have an evicted pod
I have two worker nodes
I keep deleting the pod it seems to keep spawning a new one

Answers

  • chrispokorni
    chrispokorni Posts: 2,337

    Hi @bdkdavid,

    Did you manage to successfully complete Step 1 of Lab Exercise 11.2?

    If you have two worker nodes, is the control plane node still tainted with the default master taint? It may be possible that the DaemonSet controller attempts to run an ingress pod on the control plane node as well.

    What are the states of your nodes in kubectl get nodes?

    What are the events showing for the evicted pod in the kubectl describe pod <pod-name> command?

    Regards,
    -Chris

  • bdkdavid
    bdkdavid Posts: 32

    my contol plan is still tainted: I added a second worker node

  • bdkdavid
    bdkdavid Posts: 32

    kubectl get nodes -o wide
    NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
    kubemaster03-containerd-runc Ready control-plane,master 16d v1.23.6 192.168.100.146 Ubuntu 20.04.4 LTS 5.4.0-110-generic containerd://1.6.4
    kubeworker03-containerd-runc Ready 16d v1.23.6 192.168.100.147 Ubuntu 20.04.4 LTS 5.4.0-110-generic containerd://1.6.4
    kubeworker04-containerd Ready 5d17h v1.23.6 192.168.100.148 Ubuntu 20.04.4 LTS 5.4.0-110-generic containerd://1.6.4

  • bdkdavid
    bdkdavid Posts: 32

    kubectl describe pod myingress-ingress-nginx-controller-nrcgx
    Name: myingress-ingress-nginx-controller-nrcgx
    Namespace: default
    Priority: 0
    Node: kubemaster03-containerd-runc/
    Start Time: Tue, 17 May 2022 17:37:07 +0000
    Labels: app.kubernetes.io/component=controller
    app.kubernetes.io/instance=myingress
    app.kubernetes.io/name=ingress-nginx
    controller-revision-hash=75b8d7d4fb
    pod-template-generation=2
    Annotations: linkerd.io/inject: ingress
    Status: Failed
    Reason: Evicted
    Message: Pod The node had condition: [DiskPressure].
    IP:
    IPs:
    Controlled By: DaemonSet/myingress-ingress-nginx-controller
    Containers:
    controller:
    Image: k8s.gcr.io/ingress-nginx/controller:v1.2.0@sha256:d8196e3bc1e72547c5dec66d6556c0ff92a23f6d0919b206be170bc90d5f9185
    Ports: 80/TCP, 443/TCP, 8443/TCP
    Host Ports: 0/TCP, 0/TCP, 0/TCP
    Args:
    /nginx-ingress-controller
    --publish-service=$(POD_NAMESPACE)/myingress-ingress-nginx-controller
    --election-id=ingress-controller-leader
    --controller-class=k8s.io/ingress-nginx
    --ingress-class=nginx
    --configmap=$(POD_NAMESPACE)/myingress-ingress-nginx-controller
    --validating-webhook=:8443
    --validating-webhook-certificate=/usr/local/certificates/cert
    --validating-webhook-key=/usr/local/certificates/key
    Requests:
    cpu: 100m
    memory: 90Mi
    Liveness: http-get http://:10254/healthz delay=10s timeout=1s period=10s #success=1 #failure=5
    Readiness: http-get http://:10254/healthz delay=10s timeout=1s period=10s #success=1 #failure=3
    Environment:
    POD_NAME: myingress-ingress-nginx-controller-nrcgx (v1:metadata.name)
    POD_NAMESPACE: default (v1:metadata.namespace)
    LD_PRELOAD: /usr/local/lib/libmimalloc.so
    Mounts:
    /usr/local/certificates/ from webhook-cert (ro)
    /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-q7bnl (ro)
    Volumes:
    webhook-cert:
    Type: Secret (a volume populated by a Secret)
    SecretName: myingress-ingress-nginx-admission
    Optional: false
    kube-api-access-q7bnl:
    Type: Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds: 3607
    ConfigMapName: kube-root-ca.crt
    ConfigMapOptional:
    DownwardAPI: true
    QoS Class: Burstable
    Node-Selectors: kubernetes.io/os=linux
    Tolerations: node.kubernetes.io/disk-pressure:NoSchedule op=Exists
    node.kubernetes.io/memory-pressure:NoSchedule op=Exists
    node.kubernetes.io/not-ready:NoExecute op=Exists
    node.kubernetes.io/pid-pressure:NoSchedule op=Exists
    node.kubernetes.io/unreachable:NoExecute op=Exists
    node.kubernetes.io/unschedulable:NoSchedule op=Exists
    Events:
    Type Reason Age From Message
    ---- ------ ---- ---- -------
    Warning Evicted 2m10s kubelet The node had condition: [DiskPressure].
    Normal Scheduled 2m10s default-scheduler Successfully assigned default/myingress-ingress-nginx-controller-nrcgx to kubemaster03-containerd-runc

  • bdkdavid
    bdkdavid Posts: 32

    I do have a question about daemon sets
    Does it also apply to control plane nodes?
    Mine I left tainted because in a production environment you will use them for regular containers

  • bdkdavid
    bdkdavid Posts: 32

    kubectl get pods
    NAME READY STATUS RESTARTS AGE
    myingress-ingress-nginx-controller-5dzdp 1/2 CrashLoopBackOff 604 (18s ago) 2d11h
    myingress-ingress-nginx-controller-jtzd7 1/1 Running 8 (24m ago) 2d11h
    myingress-ingress-nginx-controller-w77h4 0/2 Evicted 0 10m
    web-one-7fb5455897-cndkh 1/1 Running 1 (29m ago) 26h
    web-one-7fb5455897-nq4bh 1/1 Running 1 (29m ago) 26h
    web-two-6565978c8b-xhhqh 1/1 Running 1 (29m ago) 26h
    web-two-6565978c8b-xl8g5 1/1 Running 1 (29m ago) 26h

  • bdkdavid
    bdkdavid Posts: 32

    when is your office hours

  • fcioanca
    fcioanca Posts: 2,144

    Hi @bdkdavid

    If you are enrolled in a bootcamp, please check out the Logistics course available in your learner dashboard for hours and Zoom links, along with other useful details.

    Regards,

    Flavia

  • chrispokorni
    chrispokorni Posts: 2,337

    Hi @bdkdavid,

    The DiskPressure node condition tells us that the kubemaster03-containerd-runc node may be low on disk space. Provisioning the control plane node with additional disk space should help.

    I am noticing that your nodes have IP addresses from the 192.168.100.x subnet. What pod network is your CNI network plugin using? An overlap between the nodes' IP subnet and pods' IP subnet will also cause issues with your cluster.

    Also noticing the CrashLoopBackOff on the first myingress-ingress-nginx-controller pod, which may be caused by linkerd inject. What is the version of linkerd?

    You will find the office hours schedule and access information in the logistics course of your boot camp.

    Regards,
    -Chris

  • bdkdavid
    bdkdavid Posts: 32

    kubectl get nodes -o jsonpath='{.items[*].spec.podCIDR}'
    192.168.0.0/24 192.168.1.0/24 192.168.2.0/24

    kubectl cluster-info dump | grep -m 1 cluster-cidr
    "--cluster-cidr=192.168.0.0/16"

  • bdkdavid
    bdkdavid Posts: 32

    linkerd version
    Client version: stable-2.11.2
    Server version: stable-2.11.2

  • chrispokorni
    chrispokorni Posts: 2,337

    Hi @bdkdavid,

    From your latest comment, it seems that the nodes and pods IP subnets overlap, which should be avoided in a cluster.

    The linkerd inject can be fixed for the ingress controller by running step 11.2.11 with two additional options (not needed if downgrading to earlier linkerd versions such as 2.9 or 2.10):

    kubectl get ds myingress-ingress-nginx-controller -o yaml | linkerd inject --ingress --skip-inbound-ports 443 --skip-outbound-ports 443 - | kubectl apply -f -

    Regards,
    -Chris

  • bdkdavid
    bdkdavid Posts: 32

    kubectl describe pod myingress-ingress-nginx-controller-nrcgx
    Name: myingress-ingress-nginx-controller-nrcgx
    Namespace: default
    Priority: 0
    Node: kubemaster03-containerd-runc/
    Start Time: Tue, 17 May 2022 17:37:07 +0000
    Labels: app.kubernetes.io/component=controller
    app.kubernetes.io/instance=myingress
    app.kubernetes.io/name=ingress-nginx
    controller-revision-hash=75b8d7d4fb
    pod-template-generation=2
    Annotations: linkerd.io/inject: ingress
    Status: Failed
    Reason: Evicted
    Message: Pod The node had condition: [DiskPressure].
    IP:
    IPs:
    Controlled By: DaemonSet/myingress-ingress-nginx-controller
    Containers:
    controller:
    Image: k8s.gcr.io/ingress-nginx/controller:v1.2.0@sha256:d8196e3bc1e72547c5dec66d6556c0ff92a23f6d0919b206be170bc90d5f9185
    Ports: 80/TCP, 443/TCP, 8443/TCP
    Host Ports: 0/TCP, 0/TCP, 0/TCP
    Args:
    /nginx-ingress-controller
    --publish-service=$(POD_NAMESPACE)/myingress-ingress-nginx-controller
    --election-id=ingress-controller-leader
    --controller-class=k8s.io/ingress-nginx
    --ingress-class=nginx
    --configmap=$(POD_NAMESPACE)/myingress-ingress-nginx-controller
    --validating-webhook=:8443
    --validating-webhook-certificate=/usr/local/certificates/cert
    --validating-webhook-key=/usr/local/certificates/key
    Requests:
    cpu: 100m
    memory: 90Mi
    Liveness: http-get http://:10254/healthz delay=10s timeout=1s period=10s #success=1 #failure=5
    Readiness: http-get http://:10254/healthz delay=10s timeout=1s period=10s #success=1 #failure=3
    Environment:
    POD_NAME: myingress-ingress-nginx-controller-nrcgx (v1:metadata.name)
    POD_NAMESPACE: default (v1:metadata.namespace)
    LD_PRELOAD: /usr/local/lib/libmimalloc.so
    Mounts:
    /usr/local/certificates/ from webhook-cert (ro)
    /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-q7bnl (ro)
    Volumes:
    webhook-cert:
    Type: Secret (a volume populated by a Secret)
    SecretName: myingress-ingress-nginx-admission
    Optional: false
    kube-api-access-q7bnl:
    Type: Projected (a volume that contains injected data from multiple sources)
    TokenExpirationSeconds: 3607
    ConfigMapName: kube-root-ca.crt
    ConfigMapOptional:
    DownwardAPI: true
    QoS Class: Burstable
    Node-Selectors: kubernetes.io/os=linux
    Tolerations: node.kubernetes.io/disk-pressure:NoSchedule op=Exists
    node.kubernetes.io/memory-pressure:NoSchedule op=Exists
    node.kubernetes.io/not-ready:NoExecute op=Exists
    node.kubernetes.io/pid-pressure:NoSchedule op=Exists
    node.kubernetes.io/unreachable:NoExecute op=Exists
    node.kubernetes.io/unschedulable:NoSchedule op=Exists
    Events:
    Type Reason Age From Message
    ---- ------ ---- ---- -------
    Warning Evicted 2m10s kubelet The node had condition: [DiskPressure].
    Normal Scheduled 2m10s default-scheduler Successfully assigned default/myingress-ingress-nginx-controller-nrcgx to kubemaster03-containerd-runc

  • bdkdavid
    bdkdavid Posts: 32

    I ran the above linkerd command my output is
    kubectl get pods|grep nginx
    myingress-ingress-nginx-controller-682jj 2/2 Running 0 2m49s
    myingress-ingress-nginx-controller-9zzs9 0/2 Evicted 0 53s
    myingress-ingress-nginx-controller-cljc2 2/2 Running 0 2m20s

  • bdkdavid
    bdkdavid Posts: 32

    Also,
    Two part question:
    what do you recommend about the conflicting networks
    also,
    when we are installing calico in chapter 3 what changes do you recommend that made?
    Even through they seem to be on different subnets
    I want to rebuild my cluster better
    What do you recommend?

  • chrispokorni
    chrispokorni Posts: 2,337
    edited May 2022

    Hi @bdkdavid,

    In order to prevent the overlapping pod network 192.168.0.0/16 with the node/VM network 192.168.100.x/y, there are two solutions (I personally would implement option 1):

    1 - Keep the hypervisor managed network to 192.168.100.x (or similar private network), and un-comment - name: CALICO_IPV4POOL_CIDR and the value: "..../16" lines from the calico.yaml file, while updating the value to "10.200.0.0/16" (in Step 12 of Lab 3.1). In addition, the kubeadm-config.yaml file needs to reflect the same pod network on the last line podSubnet: 10.200.0.0/16 (step 15.b of Lab 3.1).

    2 - Keep calico.yaml and kubeadm-config.yaml as presented in the lab guide, but make changes to the DHCP server configuration on your hypervisor to use a distinct private network 10.200.0.x/y (or similar private subnet).

    Also, make sure you do not overlap with the default Services network managed by the control plane 10.96.0.0/12 (with IP addresses ranging from 10.96.0.0 to 10.111.255.254) :wink:

    I agree that the nodes and pods seem to be on different subnets, but eventually iptables will store routs to ranges/subnets instead of individual IP addresses, without being able to tell the difference when a particular IP of a range belongs to a node, and when to a pod.

    The Running 2/2 confirms that the linkerd inject worked this time on two of the three DaemonSet replicas, but the Evicted DS replica is still related to insufficient disk space on the control plane node.

    As you rebuild your cluster, the control plane VM should be provisioned with more disk space than it has currently.

    Regards,
    -Chris

  • bdkdavid
    bdkdavid Posts: 32

    df /
    Filesystem 1K-blocks Used Available Use% Mounted on
    /dev/mapper/ubuntu--vg-ubuntu--lv 10255636 9680432 34532 100% /

    sudo -i
    lvm
    lvm> lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
    Size of logical volume ubuntu-vg/ubuntu-lv changed from 10.00 GiB (2560 extents) to 18.22 GiB (4665 extents).
    Logical volume ubuntu-vg/ubuntu-lv successfully resized.
    lvm> exit
    Exiting.

    resize2fs /dev/ubuntu-vg/ubuntu-lv
    resize2fs 1.45.5 (07-Jan-2020)
    Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
    old_desc_blocks = 2, new_desc_blocks = 3
    The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 4776960 (4k) blocks long.

    df -h
    Filesystem Size Used Avail Use% Mounted on
    udev 1.9G 0 1.9G 0% /dev
    tmpfs 391M 2.8M 388M 1% /run
    /dev/mapper/ubuntu--vg-ubuntu--lv 18G 9.3G 7.8G 55% /
    tmpfs 2.0G 0 2.0G 0% /dev/shm
    tmpfs 5.0M 0 5.0M 0% /run/lock
    tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
    /dev/loop0 68M 68M 0 100% /snap/lxd/21835
    /dev/loop3 68M 68M 0 100% /snap/lxd/22753
    /dev/loop5 62M 62M 0 100% /snap/core20/1434
    /dev/loop4 45M 45M 0 100% /snap/snapd/15534
    /dev/loop2 44M 44M 0 100% /snap/snapd/14978
    /dev/loop1 62M 62M 0 100% /snap/core20/1328
    /dev/sda2 1.8G 209M 1.5G 13% /boot
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/57dbd0edabbd010744c8fb71f9652b92d302b57d0999136ab46fb6968a257df0/shm
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/6eed231afa228174899702ef210281be517c762e291ad4e842fed4aa65c0c4b2/shm
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/e9189ca3e5244c7f93e3f0778fe240c4c6189a4e5b616bae2b28f7ef69533129/shm
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/4d87b10d891d67a6b1f8937d97ddd97190bec80bf217b775faad8febdaa2429f/shm
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/e9189ca3e5244c7f93e3f0778fe240c4c6189a4e5b616bae2b28f7ef69533129/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/4d87b10d891d67a6b1f8937d97ddd97190bec80bf217b775faad8febdaa2429f/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/57dbd0edabbd010744c8fb71f9652b92d302b57d0999136ab46fb6968a257df0/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/6eed231afa228174899702ef210281be517c762e291ad4e842fed4aa65c0c4b2/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/2e891151c0613eade5cac5c82b488ec2477314cb5822de7610252e4dca6b3a57/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/7f7e10f375f5101988c8062e62aa0ebf7180d2d3ad8449bddcedb2d3cf22b466/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/316cebd8c5f1d7090d9618fe56cf01b03784bd372302ce030c27df1a36a3e59d/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/7e533f3237d511e5b8ac1f8976bb0035d8812910060b48634efd506cbdc8b481/rootfs
    tmpfs 3.8G 12K 3.8G 1% /var/lib/kubelet/pods/d3ae0de6-7380-4bb5-bf2e-b90de44d7b50/volumes/kubernetes.io~projected/kube-api-access-4fgxn
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/26fd1e057847b09ebc82f8cf4a267390a43828234a6a5361bb50b04043cbc109/shm
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/26fd1e057847b09ebc82f8cf4a267390a43828234a6a5361bb50b04043cbc109/rootfs
    tmpfs 3.8G 12K 3.8G 1% /var/lib/kubelet/pods/12c871df-3ded-419b-91bf-4c3e539ead2c/volumes/kubernetes.io~projected/kube-api-access-lxv99
    tmpfs 3.8G 12K 3.8G 1% /var/lib/kubelet/pods/0dda6999-f6b1-4312-babc-c624600616d2/volumes/kubernetes.io~projected/kube-api-access-khpgq
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/411377f55b8ded85ae1de7e661746a2ab5b81bb8e72df6bca4093e0aa6dcb4d3/shm
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/411377f55b8ded85ae1de7e661746a2ab5b81bb8e72df6bca4093e0aa6dcb4d3/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/8c4af21475246f9cfe5f0e7246ad7dab44fafc459dc59aee434f2b250a5620b4/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/db4736fbdee967f65f932b81173af512e6239ce9cfb9f9f911e0406185062244/rootfs
    shm 64M 0 64M 0% /run/containerd/io.containerd.grpc.v1.cri/sandboxes/c0608e61902b62ca8058cc3c5e527c0025786d8d5b2fc52fdaf729179a90d60b/shm
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/c0608e61902b62ca8058cc3c5e527c0025786d8d5b2fc52fdaf729179a90d60b/rootfs
    overlay 18G 9.3G 7.8G 55% /run/containerd/io.containerd.runtime.v2.task/k8s.io/83e5a388bc823dd00b4c15ac0fd5ffa194888011e942881ee40d864f0153a4ac/rootfs
    tmpfs 391M 0 391M 0% /run/user/1000

    reboot

    kubectl get pods | grep nginx
    myingress-ingress-nginx-controller-682jj 2/2 Running 0 23h
    myingress-ingress-nginx-controller-cljc2 2/2 Running 0 23h
    myingress-ingress-nginx-controller-fg7gd 2/2 Running 1 (17h ago) 17h

  • bdkdavid
    bdkdavid Posts: 32

    So to Keep my current configuration:
    I need to edit two files in option one above:
    calico.yaml
    kubeadm-config.yaml

    How do I reapply each?
    They seem to be two different processes:
    the kubeadm-config.yaml would kubectl edit

    Is there a calico *ctl
    What would that command look like?

  • bdkdavid
    bdkdavid Posts: 32

    Also, I partitioned my hard drive with 20 GB but it seem to only see 10 GB

    Can you clarify. Please?

    This does not make any real sense to me!

    df /
    Filesystem 1K-blocks Used Available Use% Mounted on
    /dev/mapper/ubuntu--vg-ubuntu--lv 10255636 9680432 34532 100% /

  • chrispokorni
    chrispokorni Posts: 2,337

    Hi @bdkdavid,

    There is a calicoctl CLI tool, but it is not necessary for the edits I suggested earlier. Simply use vim, nano, or any editor to update the calico.yaml file, and then kubeadm-config.yaml.

    They cannot be re-applied on an existing cluster, the process needs a new cluster bootstrapping - as in a new kubeadm init followed by the necessary kubeadm join commands for worker nodes.

    From an earlier output I see the 18.2 GB lv and then the 10 GB lv. What happened in between? Is the hypervisor "aware" of such dynamic resize? If the VM was provisioned with 10 GB, then that's all it will be aware of, unless the hypervisor allows for the VM disk to be resized as well.

    Regards,
    -Chris

  • bdkdavid
    bdkdavid Posts: 32

    In regards to method one of changing the Pod network below:

    1 - Keep the hypervisor managed network to 192.168.100.x (or similar private network), and un-comment - name: CALICO_IPV4POOL_CIDR and the value: "..../16" lines from the calico.yaml file, while updating the value to "10.200.0.0/16" (in Step 12 of Lab 3.1). In addition, the kubeadm-config.yaml file needs to reflect the same pod network on the last line podSubnet: 10.200.0.0/16 (step 15.b of Lab 3.1).

    Once I edit this files, does this happen automatically, or do I have to run a command.
    What is the time for it to transition to new network?

  • chrispokorni
    chrispokorni Posts: 2,337

    Hi @bdkdavid,

    While there are cases where users attempted to modify/replace the existing pod CIDR of clusters of various Kubernetes distributions, I would recommend you rebuild the cluster, as mentioned earlier:

    the process needs a new cluster bootstrapping - as in a new kubeadm init followed by the necessary kubeadm join commands for worker nodes.

    Regards,
    -Chris

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