需要帮助解决问题

Question

我有一个自动安装Patroni集群的ansible项目。patroni.conf文件中存在问题。

每个主机都需要不同的配置。

例如：

主机1配置：

scope: postgres
name: postgresql0

restapi:
    listen: 10.0.13.242:8008
    connect_address: 10.0.13.242:8008

etcd:
    host: 10.0.13.247:2379

bootstrap:
    dcs:
        ttl: 30
        loop_wait: 10
        retry_timeout: 10
        maximum_lag_on_failover: 1048576
        postgresql:
            use_pg_rewind: true

    initdb:
    - encoding: UTF8
    - data-checksums

    pg_hba:
    - host replication replicator 127.0.0.1/32 md5
    - host replication replicator 10.0.13.242/24 md5
    - host replication replicator 10.0.13.243/24 md5
    - host replication replicator 10.0.13.244/24 md5
    - host replication replicator 10.0.13.245/24 md5
    - host all all 0.0.0.0/0 md5

    users:
        admin:
            password: admin
            options:
                - createrole
                - createdb

postgresql:
    listen: 10.0.13.242:5432 
    connect_address: 10.0.13.242:5432
    data_dir: /data/patroni
    pgpass: /tmp/pgpass
    authentication:
        replication:
            username: replicator
            password: replicator_pass
        superuser:
            username: postgres
            password: postgres
    parameters:
        unix_socket_directories: '.'

tags:
    nofailover: false
    noloadbalance: false
    clonefrom: false
    nosync: false

东道2会议：

scope: postgres
name: postgresql0

restapi:
    listen: 10.0.13.243:8008
    connect_address: 10.0.13.243:8008

etcd:
    host: 10.0.13.247:2379

bootstrap:
    dcs:
        ttl: 30
        loop_wait: 10
        retry_timeout: 10
        maximum_lag_on_failover: 1048576
        postgresql:
            use_pg_rewind: true

    initdb:
    - encoding: UTF8
    - data-checksums

    pg_hba:
    - host replication replicator 127.0.0.1/32 md5
    - host replication replicator 10.0.13.242/24 md5
    - host replication replicator 10.0.13.243/24 md5
    - host replication replicator 10.0.13.244/24 md5
    - host replication replicator 10.0.13.245/24 md5
    - host all all 0.0.0.0/0 md5

    users:
        admin:
            password: admin
            options:
                - createrole
                - createdb

postgresql:
    listen: 10.0.13.243:5432 
    connect_address: 10.0.13.243:5432
    data_dir: /data/patroni
    pgpass: /tmp/pgpass
    authentication:
        replication:
            username: replicator
            password: replicator_pass
        superuser:
            username: postgres
            password: postgres
    parameters:
        unix_socket_directories: '.'

tags:
    nofailover: false
    noloadbalance: false
    clonefrom: false
    nosync: false

问:我如何编写bash脚本，该脚本向用户询问主机名，替换listen和connect_address行，然后询问名称并在" name“行中替换它。我如何循环这个脚本呢？

Answer 1

您可以使用无源模板特征完成这一任务。基本上，您将获取.conf文件的副本，并使用jinja2格式化变量替换需要动态定义的任何值。看起来可能是这样的：

scope: postgres
name: {{ desired_name }}

restapi:
    listen: {{ ansible_default_ipv4.address }}:8008
    connect_address: {{ ansible_default_ipv4.address }}:8008

etcd:
    host: 10.0.13.247:2379

bootstrap:
    dcs:
        ttl: 30
        loop_wait: 10
        retry_timeout: 10
        maximum_lag_on_failover: 1048576
        postgresql:
            use_pg_rewind: true

    initdb:
    - encoding: UTF8
    - data-checksums

    pg_hba:
    - host replication replicator 127.0.0.1/32 md5
    - host replication replicator 10.0.13.242/24 md5
    - host replication replicator 10.0.13.243/24 md5
    - host replication replicator 10.0.13.244/24 md5
    - host replication replicator 10.0.13.245/24 md5
    - host all all 0.0.0.0/0 md5

    users:
        admin:
            password: admin
            options:
                - createrole
                - createdb

postgresql:
    listen: 10.0.13.243:5432 
    connect_address: 10.0.13.243:5432
    data_dir: /data/patroni
    pgpass: /tmp/pgpass
    authentication:
        replication:
            username: replicator
            password: replicator_pass
        superuser:
            username: postgres
            password: postgres
    parameters:
        unix_socket_directories: '.'

tags:
    nofailover: false
    noloadbalance: false
    clonefrom: false
    nosync: false

现在，模板模块的工作方式与复制模块非常相似，因为它只是将conf文件从ansible服务器移动到目标(在剧本中指定源和目的地)。不同的是，对于其中的每个变量，ansible都填充了信息。这可以来自事实，也可以来自一个文件，在剧本中，作为附加的args添加到您运行的命令甚至在剧本执行过程中被提示中。

在我的示例中，将从目标主机检索ip地址，并在传输时将其插入到conf文件中，并且需要指定desired_name变量，或者通过上面链接的方法指定提示符，或者在最终运行的ansible命令上使用-- either args标志。