diff options
Diffstat (limited to 'roles/kubernetes/kubeadm/master')
6 files changed, 246 insertions, 111 deletions
diff --git a/roles/kubernetes/kubeadm/master/tasks/main.yml b/roles/kubernetes/kubeadm/master/tasks/main.yml index 7cc6fe94..9af041b2 100644 --- a/roles/kubernetes/kubeadm/master/tasks/main.yml +++ b/roles/kubernetes/kubeadm/master/tasks/main.yml @@ -1,67 +1,25 @@ --- -- name: check if kubeconfig admin.conf already exists - stat: - path: /etc/kubernetes/admin.conf - register: kubeconfig_admin_stats +# - name: create direcotry for encryption config +# file: +# name: /etc/kubernetes/encryption +# state: directory +# mode: 0700 -### cluster not yet initialized +# - name: install encryption config +# template: +# src: encryption-config.j2 +# dest: /etc/kubernetes/encryption/config +# mode: 0600 -- name: create new cluster - when: kubeconfig_admin_stats.stat.exists == False - block: - - name: generate bootstrap token for new cluster - command: kubeadm token generate - changed_when: False - check_mode: no - register: kubeadm_token_generate +- name: install primary master + include_tasks: primary-master.yml + when: "'_kubernetes_primary_master_' in group_names" - - name: create kubernetes config directory - file: - path: /etc/kubernetes - state: directory +- name: install secondary masters + include_tasks: secondary-masters.yml + when: "'_kubernetes_primary_master_' not in group_names" - ## TODO test whether the generated cluster configs really works - since it has never been used... - - name: install cluster config for kubeadm - template: - src: kubeadm-cluster.config.j2 - dest: /etc/kubernetes/kubeadm-cluster.config - - - name: set up kubernetes master - command: "kubeadm init --config '/etc/kubernetes/kubeadm-cluster.config' --token '{{ kubeadm_token_generate.stdout }}' --token-ttl 42m --skip-token-print" - args: - creates: /etc/kubernetes/pki/ca.crt - register: kubeadm_init - - - name: dump output of kubeadm init to log file - when: kubeadm_init.changed - copy: - content: "{{ kubeadm_init.stdout }}\n" - dest: /etc/kubernetes/kubeadm-init.log - -### cluster is already initialized - -- name: prepare cluster for new nodes - when: kubeconfig_admin_stats.stat.exists == True - block: - - - name: fetch list of current nodes - command: kubectl get nodes -o name - changed_when: False - check_mode: no - register: kubectl_node_list - - - name: save list of current nodes - set_fact: - kubernetes_current_nodes: "{{ kubectl_node_list.stdout_lines | map('replace', 'node/', '') | list }}" - - - name: create bootstrap token for existing cluster - when: kubernetes_nodes | difference(kubernetes_current_nodes) | length > 0 - command: kubeadm token create --ttl 42m - check_mode: no - register: kubeadm_token_create - -## - name: check if master is tainted (1/2) command: "kubectl --kubeconfig /etc/kubernetes/admin.conf get node {{ inventory_hostname }} -o json" @@ -74,28 +32,13 @@ kube_node_taints: "{% set node_info = kubectl_get_node.stdout | from_json %}{%if node_info.spec.taints is defined %}{{ node_info.spec.taints | map(attribute='key') | list }}{% endif %}" - name: remove taint from master node - when: "kubernetes.dedicated_master == False and 'node-role.kubernetes.io/master' in kube_node_taints" - command: kubectl --kubeconfig /etc/kubernetes/admin.conf taint nodes --all node-role.kubernetes.io/master- + when: not kubernetes.dedicated_master and 'node-role.kubernetes.io/master' in kube_node_taints + command: "kubectl --kubeconfig /etc/kubernetes/admin.conf taint nodes {{ inventory_hostname }} node-role.kubernetes.io/master-" - name: add taint for master node - when: "kubernetes.dedicated_master == True and 'node-role.kubernetes.io/master' not in kube_node_taints" - command: "kubectl --kubeconfig /etc/kubernetes/admin.conf taint nodes {{ ansible_nodename }} node-role.kubernetes.io/master='':NoSchedule" - -- name: install openssl - apt: - name: openssl - state: present + when: kubernetes.dedicated_master and 'node-role.kubernetes.io/master' not in kube_node_taints + command: "kubectl --kubeconfig /etc/kubernetes/admin.conf taint nodes {{ inventory_hostname }} node-role.kubernetes.io/master='':NoSchedule" -- name: get ca certificate digest - shell: "openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'" - check_mode: no - register: kube_ca_openssl - changed_when: False - -- name: set variables needed by kubernetes/nodes to join the cluster - set_fact: - kube_bootstrap_token: "{% if kubeadm_token_generate.stdout is defined %}{{ kubeadm_token_generate.stdout }}{% elif kubeadm_token_create.stdout is defined %}{{ kubeadm_token_create.stdout }}{% endif %}" - kube_bootstrap_ca_cert_hash: "sha256:{{ kube_ca_openssl.stdout }}" - name: prepare kubectl (1/2) file: @@ -107,3 +50,14 @@ dest: /root/.kube/config src: /etc/kubernetes/admin.conf state: link + +- name: add kubectl completion config for shells + with_items: + - zsh + - bash + blockinfile: + path: "/root/.{{ item }}rc" + create: yes + marker: "### {mark} ANSIBLE MANAGED BLOCK for kubectl ###" + content: | + source <(kubectl completion {{ item }}) diff --git a/roles/kubernetes/kubeadm/master/tasks/primary-master.yml b/roles/kubernetes/kubeadm/master/tasks/primary-master.yml new file mode 100644 index 00000000..115c8616 --- /dev/null +++ b/roles/kubernetes/kubeadm/master/tasks/primary-master.yml @@ -0,0 +1,109 @@ +--- +- name: check if kubeconfig kubelet.conf already exists + stat: + path: /etc/kubernetes/kubelet.conf + register: kubeconfig_kubelet_stats + +- name: generate kubeadm.config + template: + src: kubeadm.config.j2 + dest: /etc/kubernetes/kubeadm.config + register: kubeadm_config + +### cluster not yet initialized + +- name: create new cluster + when: not kubeconfig_kubelet_stats.stat.exists + block: + + #### kubeadm wants token to come from --config if --config is used + #### i think this is stupid -> TODO: send bug report + # - name: generate bootstrap token for new cluster + # command: kubeadm token generate + # changed_when: False + # check_mode: no + # register: kubeadm_token_generate + + - name: initialize kubernetes master and store log + block: + - name: initialize kubernetes master + command: "kubeadm init --config /etc/kubernetes/kubeadm.config --node-name {{ inventory_hostname }}{% if kubernetes_cri_socket is defined %} --cri-socket {{ kubernetes_cri_socket }}{% endif %}{% if kubernetes_network_plugin == 'kube-router' %} --skip-phases addon/kube-proxy{% endif %} --skip-token-print" + # command: "kubeadm init --config /etc/kubernetes/kubeadm.config{% if kubernetes_cri_socket is defined %} --cri-socket {{ kubernetes_cri_socket }}{% endif %}{% if kubernetes_network_plugin == 'kube-router' %} --skip-phases addon/kube-proxy{% endif %} --token '{{ kubeadm_token_generate.stdout }}' --token-ttl 42m --skip-token-print" + args: + creates: /etc/kubernetes/pki/ca.crt + register: kubeadm_init + + always: + - name: dump output of kubeadm init to log file + when: kubeadm_init.changed + copy: + content: "{{ kubeadm_init.stdout }}\n" + dest: /etc/kubernetes/kubeadm-init.log + + - name: create bootstrap token for existing cluster + command: kubeadm token create --ttl 42m + check_mode: no + register: kubeadm_token_generate + + +### cluster is already initialized but config has changed + +- name: upgrade cluster config + when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is changed + block: + + - name: fail for cluster upgrades + fail: + msg: "upgrading cluster config is currently not supported!" + + +### cluster is already initialized + +- name: prepare cluster for new nodes + when: kubeconfig_kubelet_stats.stat.exists and kubeadm_config is not changed + block: + + - name: fetch list of current nodes + command: kubectl --kubeconfig /etc/kubernetes/admin.conf get nodes -o name + changed_when: False + check_mode: no + register: kubectl_node_list + + - name: save list of current nodes + set_fact: + kubernetes_current_nodes: "{{ kubectl_node_list.stdout_lines | map('replace', 'node/', '') | list }}" + + - name: create bootstrap token for existing cluster + when: "groups['_kubernetes_nodes_'] | difference(kubernetes_current_nodes) | length > 0" + command: kubeadm token create --ttl 42m + check_mode: no + register: kubeadm_token_create + + +## calculate certificate digest + +- name: install openssl + apt: + name: openssl + state: present + +- name: get ca certificate digest + shell: "set -o pipefail && openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'" + args: + executable: /bin/bash + check_mode: no + register: kube_ca_openssl + changed_when: False + +- name: set variables needed by kubernetes/nodes to join the cluster + set_fact: + kube_bootstrap_token: "{% if kubeadm_token_generate.stdout is defined %}{{ kubeadm_token_generate.stdout }}{% elif kubeadm_token_create.stdout is defined %}{{ kubeadm_token_create.stdout }}{% endif %}" + kube_bootstrap_ca_cert_hash: "sha256:{{ kube_ca_openssl.stdout }}" + delegate_to: "{{ item }}" + delegate_facts: True + loop: "{{ groups['_kubernetes_nodes_'] }}" + +## Network Plugin + +# - name: install network plugin +# include_tasks: "net_{{ kubernetes_network_plugin }}.yml" diff --git a/roles/kubernetes/kubeadm/master/tasks/secondary-masters.yml b/roles/kubernetes/kubeadm/master/tasks/secondary-masters.yml new file mode 100644 index 00000000..c00c3203 --- /dev/null +++ b/roles/kubernetes/kubeadm/master/tasks/secondary-masters.yml @@ -0,0 +1,48 @@ +--- +- name: fetch secrets needed for secondary master + run_once: true + delegate_to: "{{ groups['_kubernetes_primary_master_'] | first }}" + block: + + - name: fetch list of current nodes + command: kubectl --kubeconfig /etc/kubernetes/admin.conf get nodes -o name + changed_when: False + check_mode: no + register: kubectl_node_list + + - name: save list of current nodes + set_fact: + kubernetes_current_nodes: "{{ kubectl_node_list.stdout_lines | map('replace', 'node/', '') | list }}" + + - name: upload certs + when: "groups['_kubernetes_masters_'] | difference(kubernetes_current_nodes) | length > 0" + command: kubeadm init phase upload-certs --upload-certs + check_mode: no + register: kubeadm_upload_certs + + +- name: extracting encryption key for certs + set_fact: + kubeadm_upload_certs_key: "{% if kubeadm_upload_certs.stdout is defined %}{{ kubeadm_upload_certs.stdout_lines | last }}{% endif %}" + +- name: join kubernetes secondary master node and store log + block: + - name: join kubernetes secondary master node + command: "kubeadm join 127.0.0.1:6443 --node-name {{ inventory_hostname }} --apiserver-bind-port 6442{% if kubernetes_overlay_node_ip is defined %} --apiserver-advertise-address {{ kubernetes_overlay_node_ip }}{% endif %}{% if kubernetes_cri_socket is defined %} --cri-socket {{ kubernetes_cri_socket }}{% endif %} --token '{{ kube_bootstrap_token }}' --discovery-token-ca-cert-hash '{{ kube_bootstrap_ca_cert_hash }}' --control-plane --certificate-key {{ kubeadm_upload_certs_key }}" + args: + creates: /etc/kubernetes/kubelet.conf + register: kubeadm_join + + always: + - name: dump output of kubeadm join to log file + when: kubeadm_join is changed + # This is not a handler by design to make sure this action runs at this point of the play. + copy: # noqa 503 + content: "{{ kubeadm_join.stdout }}\n" + dest: /etc/kubernetes/kubeadm-join.log + + # TODO: acutally check if node has registered +- name: give the new master(s) a moment to register + when: kubeadm_join is changed + pause: # noqa 503 + seconds: 5 diff --git a/roles/kubernetes/kubeadm/master/templates/encryption-config.j2 b/roles/kubernetes/kubeadm/master/templates/encryption-config.j2 new file mode 100644 index 00000000..345c9bf9 --- /dev/null +++ b/roles/kubernetes/kubeadm/master/templates/encryption-config.j2 @@ -0,0 +1,13 @@ +kind: EncryptionConfiguration +apiVersion: apiserver.config.k8s.io/v1 +resources: + - resources: + - secrets + providers: + - secretbox: + keys: +{% for key in kubernetes_secrets.encryption_config_keys %} + - name: key{{ loop.index }} + secret: {{ key }} +{% endfor %} + - identity: {} diff --git a/roles/kubernetes/kubeadm/master/templates/kubeadm-cluster.config.j2 b/roles/kubernetes/kubeadm/master/templates/kubeadm-cluster.config.j2 deleted file mode 100644 index 07c4dddd..00000000 --- a/roles/kubernetes/kubeadm/master/templates/kubeadm-cluster.config.j2 +++ /dev/null @@ -1,34 +0,0 @@ -{# https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta1 #} -apiVersion: kubeadm.k8s.io/v1beta1 -kind: ClusterConfiguration -kubernetesVersion: v{{ kubernetes.version }} -clusterName: {{ kubernetes.cluster_name }} -certificatesDir: /etc/kubernetes/pki -{% if kubernetes.api_advertise_ip %} -controlPlaneEndpoint: "{{ kubernetes.api_advertise_ip }}:6443" -{% endif %} -imageRepository: k8s.gcr.io -networking: - dnsDomain: cluster.local - podSubnet: {{ kubernetes.pod_ip_range }} - serviceSubnet: {{ kubernetes.service_ip_range }} -etcd: - local: - dataDir: /var/lib/etcd -apiServer: -{% if kubernetes.api_extra_sans | length > 0 %} - certSANs: -{% for san in kubernetes.api_extra_sans %} - - {{ san }} -{% endfor %} -{% endif %} - extraArgs: -{% if kubernetes.api_advertise_ip %} - advertise-address: {{ kubernetes.api_advertise_ip }} -{% endif %} - authorization-mode: Node,RBAC - timeoutForControlPlane: 4m0s -controllerManager: {} -scheduler: {} -dns: - type: CoreDNS diff --git a/roles/kubernetes/kubeadm/master/templates/kubeadm.config.j2 b/roles/kubernetes/kubeadm/master/templates/kubeadm.config.j2 new file mode 100644 index 00000000..f48a34f3 --- /dev/null +++ b/roles/kubernetes/kubeadm/master/templates/kubeadm.config.j2 @@ -0,0 +1,45 @@ +{# https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2 #} +{# #} +apiVersion: kubeadm.k8s.io/v1beta2 +kind: InitConfiguration +{# TODO: this is ugly but we want to create our own token so we can #} +{# better control it's lifetime #} +bootstrapTokens: +- ttl: "1s" +localAPIEndpoint: + bindPort: 6442 +{% if kubernetes_overlay_node_ip is defined %} + advertiseAddress: {{ kubernetes_overlay_node_ip }} +{% endif %} +--- +apiVersion: kubeadm.k8s.io/v1beta2 +kind: ClusterConfiguration +kubernetesVersion: {{ kubernetes_version }} +clusterName: {{ kubernetes.cluster_name }} +imageRepository: k8s.gcr.io +controlPlaneEndpoint: 127.0.0.1:6443 +networking: + dnsDomain: {{ kubernetes.dns_domain | default('cluster.local') }} + podSubnet: {{ kubernetes.pod_ip_range }} + serviceSubnet: {{ kubernetes.service_ip_range }} +apiServer: + # extraArgs: + # encryption-provider-config: /etc/kubernetes/encryption/config + # extraVolumes: + # - name: encryption-config + # hostPath: /etc/kubernetes/encryption + # mountPath: /etc/kubernetes/encryption + # readOnly: true + # pathType: Directory +{% if (kubernetes.api_extra_sans | default([]) | length) == 0 %} + certSANs: [] +{% else %} + certSANs: + {{ kubernetes.api_extra_sans | to_nice_yaml | indent(width=2) }} +{% endif %} +controllerManager: + extraArgs: + node-cidr-mask-size: "{{ kubernetes.pod_ip_range_size }}" +scheduler: {} +dns: + type: CoreDNS |