Ambari自定义服务干货

# 以hue的配置文件hue.ini为例
File(format("/usr/hdp/2.6.4.0-91/hue/desktop/conf/hue.ini"),
             content=Template("hue.ini.j2"),
             owner=params.hue_user,
             group=params.hue_group
             )
# 解读：
# 1. File的第一个变量为：实际服务的配置文件的所在地
# 2. File的第二个变量为：在服务的./package/目录下新建templates文件夹，该文件夹下放入hue.ini.j2文件，与配置文件hue.ini内容一致。
# 3. File的第三个变量为：所有者为hue
# 4. File的第四个变量为: 所在组为hue

# param.py局部
from resource_management.libraries.script.script import Script
config = Script.get_config()

http_host = config['hostname']
http_port = config['configurations']['hue-env']['http_port']
# 其中的'configurations'是代表着ambari集群已安装组件的所有xml配置文件
# 'hue-env'对应着 configuration/hue-env.xml

def start(self, env):
        import params
        env.set_params(params)
        
        Directory([params.hue_pid_dir],
                  mode=0755,
                  cd_access='a',
                  owner=params.hue_user,
                  group=params.hue_group,
                  create_parents=True
                 )
        File([params.hue_log_file, params.hue_server_pid_file],
             mode=0644,
             owner=params.hue_user,
             group=params.hue_group,
             content=''
            )
# 说明
# import导入params.py文件，该文件内有上面用到的‘hue_pid_dir’，‘hue_log_file’，‘hue_server_pid_file’变量的定义
# Directory表示执行文件夹操作，[]括起来的是要创建的文件夹名称，mode是权限，owner/group是用户/组，create_parents=True是父目录不存在时一起创建。
# create_parents=True 有待验证。
# File表示执行文件操作，[]括起来的是要创建的文件名称,mode是权限，owner/group是用户/组,content=''代表内容为空。

def stop(self, env):
        import params
        env.set_params(params)
        Directory(params.hue_pid_dir,
                  action="delete",
                  owner=params.hue_user
                 )
# 说明
# Directory表示执行文件夹操作，第一个参数为执行操作的文件夹名称，action="delete"代表删除，owner代表由哪个用户执行操作。
# File同理

<property require-input="true">
        <name>kadmin.local.password</name>
        <display-name>admin password</display-name>
        <value/>
        <property-type>PASSWORD</property-type>
        <description>The password is used to add the kerberos database administrator</description>
        <value-attributes>
            <overridable>false</overridable>
            <type>password</type>
        </value-attributes>
</property>

from resource_management.core.logger import Logger 

Logger.info("Starting sample Service") 

from resource_management.libraries.script.script import Script 
config = Script.get_config() 

ambari_server_hostname = config['clusterHostInfo']['ambari_server_host'][0]

cluster_name = str(config['clusterName'])

hostname = config['hostname']

clusterHostInfo = config['clusterHostInfo'] 
## 返回的clusterHostInfo是一个数组，我们用”,”将其分割为字符串，来看一下里面是什么 
clusterHostInfo = ",".join(params.clusterHostInfo) 
## clusterHostInfo 的值为：
snamenode_host,nm_hosts,metrics_collector_hosts,hive_metastore_host,ranger_tagsync_hosts,elasticsearch_service_hosts,ranger_usersync_hosts,slave_hosts,spark_jobhistoryserver_hosts,mymaster_hosts,infra_solr_hosts,hive_server_host,hue_server_hosts,hbase_rs_hosts,webhcat_server_host,ranger_admin_hosts,ambari_server_host,zookeeper_hosts,mysalve_hosts,spark_thriftserver_hosts,app_timeline_server_hosts,livy_server_hosts,all_ping_ports,rm_host,all_hosts,ambari_server_use_ssl,metrics_monitor_hosts,oozie_server,all_racks,all_ipv4_ips,hs_host,metrics_grafana_hosts,phoenix_query_server_hosts,ambari_server_port,namenode_host,hbase_master_hosts
## 解析：上述格式为：component_name_hosts

## 假如我们需要查看namenode所在的主机，需要怎么做呢？ 
namenode = config['clusterHostInfo']['nm_hosts'] 
## 或者 
namenode  = default("/clusterHostInfo/nm_hosts", [“localhost”]) 

## 上面这行代码的意思是，如果nm_hosts不存在，则以localhost代替。可见，default这种方法比config的那种方法要更全面。 
## 注意：以上namenode是一个数组，所以我们需要再做进一步处理，这里就不再进行demo演示了

configurations = config['configurations']
configurations = ",".join(configurations) 
## configurations 的值为：
spark-defaults,livy-log4j-properties,ranger-hdfs-audit,webhcat-log4j,ranger-yarn-plugin-properties,ranger-hdfs-policymgr-ssl,pig-env,hue-hive-site,hdfs-logsearch-conf,slider-env,ranger-hive-policymgr-ssl,hivemetastore-site,llap-cli-log4j2,spark-hive-site-override,ranger-hive-security,spark-log4j-properties,ams-logsearch-conf,ams-hbase-security-site,oozie-env,mapred-site,hue-mysql-site,spark-env,hdfs-site,hue-hadoop-site,ams-env,ams-site,ams-hbase-policy,zookeeper-log4j,hadoop-metrics2.properties,hue-env,hdfs-log4j,hbase-site,ranger-hbase-plugin-properties,ams-log4j,ranger-yarn-audit,hive-interactive-env,ranger-hdfs-plugin-properties,hue-pig-site,pig-properties,oozie-log4j,hawq-limits-env,oozie-logsearch-conf,ams-hbase-site,hive-env,ams-hbase-log4j,hadoop-env,hue-solr-site,hive-logsearch-conf,tez-interactive-site,yarn-site,parquet-logging,hive-exec-log4j,webhcat-site,sqoop-site,hawq-sysctl-env,hive-log4j,ranger-hdfs-security,hiveserver2-site,sqoop-atlas-application.properties,mapred-env,ranger-hive-audit,ranger-hbase-security,slider-client,ssl-client,sqoop-env,livy-conf,ams-grafana-env,ranger-yarn-policymgr-ssl,ranger-hbase-audit,livy-env,hive-log4j2,hive-site,spark-logsearch-conf,spark-javaopts-properties,ams-ssl-client,yarn-client,hbase-policy,webhcat-env,hive-atlas-application.properties,hue-ugsync-site,hcat-env,tez-site,slider-log4j,spark-thrift-sparkconf,spark-thrift-fairscheduler,hue-hbase-site,mapred-logsearch-conf,yarn-log4j,hue-oozie-site,ams-grafana-ini,livy-spark-blacklist,hadoop-policy,ranger-hive-plugin-properties,ams-ssl-server,tez-env,hive-interactive-site,hawq-env,ams-hbase-env,core-site,yarn-env,hawq-site,spark-metrics-properties,hbase-logsearch-conf,hue-desktop-site,hdfs-client,yarn-logsearch-conf,zookeeper-logsearch-conf,beeline-log4j2,hiveserver2-interactive-site,ranger-yarn-security,capacity-scheduler,hbase-log4j,oozie-site,ssl-server,llap-daemon-log4j,hbase-env,hawq-check-env,zoo.cfg,ranger-hbase-policymgr-ssl,hue-spark-site,hive-exec-log4j2,zookeeper-env,pig-log4j,cluster-env

## 例如，我要获取oozie-site.xml内oozie.base.url的值
oozie_url = config['configurations']['oozie-site']['oozie.base.url']

hdp_version =  default("/commandParams/version", None)
# 说明：返回结果为2.6.4.0-91，如果没有/commandParams/version的话，结果返回None

tmp_dir = Script.get_tmp_dir()
# 结果：/var/lib/ambari-agent/tmp

config = Script.get_config() 
## 打印config，内容如下：
agentConfigParams,credentialStoreEnabled,taskId,configurations,clusterName,localComponents,commandType,configuration_attributes,repositoryFile,roleParams,public_hostname,configurationTags,commandId,roleCommand,configuration_credentials,commandParams,componentVersionMap,hostname,hostLevelParams,kerberosCommandParams,serviceName,role,forceRefreshConfigTagsBeforeExecution,stageId,clusterHostInfo,requestId

# 如果是数组的话，就以“,”分隔
Logger.info(",".join(config['configurations']))
# 如果是字符串就直接打印出来
Logger.info(config['configurations'])