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ansible – Appending To Lists And Dictionaries
今天在整理ansible安装k3s时，遇到了个问题，想法是在安装过程中对node能打多个label, 如： 定义hosts.ini
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[k3s_nodes] 172.20.47.254 k3s_control_node=true nodeRole=ingress,node ansible_ssh_user=root ansible_ssh_port=22 172.20.47.201 nodeRole=node ansible_ssh_user=root ansible_ssh_port=22 |
其中k3s.service.j2模块中的定义如下：
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{% if k3s_node_labels is defined and k3s_node_labels is iterable %} {% for label in k3s_node_labels %} {% for key, value in label.items() %} --node-label {{ key }}={{ value }} {% endfor %} {% endfor %} {% endif %} |
而生成的k3s.service应是这个结果：
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ExecStart=/usr/local/bin/k3s server \ --disable-network-policy --flannel-backend none --cluster-cidr 10.42.0.0/16 --service-cidr 10.43.0.0/16 \ --no-deploy traefik --docker --node-name 172.20.47.254 \ --node-label node.kubernetes.io/ingress= \ --node-label node.kubernetes.io/node= |
可以看到， 应该给node打两个label, 经反复尝试，终于生成了， 下面是我的k3s.yml:
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- hosts: k3s_nodes vars: #k3s_control_node_address: 172.20.47.250 # k3s_datastore_endpoint: "mysql://root:mypass@tcp(172.20.47.38:3306)/k3sdb" k3s_cluster_cidr: 10.42.0.0/16 k3s_service_cidr: 10.43.0.0/16 k3s_use_docker: true k3s_no_flannel: true k3s_no_traefik: true # k3s_control_node_address: "k8s.apiserver.io" ingress_http_port: 8000 ingress_https_port: 4443 # if set k3s_disable_network_policy=false, # it will show error: User "system:k3s-controller" cannot get resource "nodes" in API group "" at the cluster scope # refer to: https://github.com/rancher/k3s/issues/1792 k3s_disable_network_policy: true k3s_server_manifests_templates: - "manifests/calico.yaml.j2" - "manifests/coredns.yaml.j2" - "manifests/local-storage.yaml.j2" - "manifests/metrics-server-deployment.yaml.j2" - "manifests/nginx-ingress.yaml.j2" - "manifests/kuboard.yaml.j2" - "manifests/cert-manager-no-webhook.yaml.j2" pre_tasks: - name: Set k3s_node_name set_fact: k3s_node_name: "{{ inventory_hostname }}" - name: Set node labels set_fact: # k3s_node_labels: "{{ k3s_node_labels|default([]) | combine({'node.kubernetes.io/'+item: ''}) }}" k3s_node_labels: "{{ k3s_node_labels|default([]) + [{'node.kubernetes.io/'+item: ''}] }}" with_items: - "{{ nodeRole.split(',') }}" when: nodeRole is defined # tasks: # - debug: msg="{{ k3s_node_labels }}" roles: - { role: k3s, k3s_release_version: v1.18.2+k3s1 } |
定义了： k3s_node_labels: “{{ k3s_node_labels|default([]) + [{‘node.kubernetes.io/’+item: ”}] }}” 意思是定义一个列表k3s_node_labels，将with_items中的变量append到列表中， 结果是这样：
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[ { "node.kubernetes.io/ingress": "" }, { "node.kubernetes.io/node": "" } ] |
除了用+号， 也可以用union([item]) 而如果这样定义的话： k3s_node_labels: “{{ k3s_node_labels|default([]) | combine({‘node.kubernetes.io/’+item: ”}) }}” 或 k3s_node_labels: “{{ k3s_node_labels|default({}) | combine({‘node.kubernetes.io/’+item: ”}) }}” 都将会这种结果：
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{ "node.kubernetes.io/ingress": "", "node.kubernetes.io/node": "" } |