mongodb数据库从库同步主库维护js脚本

脚本是日常维护使用js脚本。适用于集群数目很多，手工操作很麻烦费时，所以写了自动脚本，在每个集群自动运行即可。
功能描述：检查本机的状态（主，从），确保从机始终从主机同步数据。
适用范围：repli set 副本集模式
运行脚本：mongo路径/mongo 10.0.0.1：30000 syncfrom.js
syncfrom.js 如下

/*
 * check rs.status, replSetSyncFrom to Primary
 * 
 * 20131216
 */
function sleep(seconds) {
        this.date = Math.round(new Date().getTime()/1000);
        while(1) {
                if(Math.round(new Date().getTime()/1000) - this.date >= seconds) break;
        }
        return true;
}
var status=rs.status();
print(status["myState"]);
var mystatus=status["myState"];
var syncingTo=status["syncingTo"];
print('syncto '+syncingTo);
members=status["members"];
if(mystatus==1)//primary
{
        print('my status is primary... no need to replSetSyncFrom')
}
else if(mystatus==2)//secondary
{
        print('my status is secondary...will start execute commmand "replSetSyncFrom" ')
        for(var i=0;i<members.length;i++)
        {
                if(members[i]["stateStr"]=="PRIMARY")
                {
                        priname=members[i]["name"]
                        print("primary: "+priname)
                        if(syncingTo==priname)
                        {
                                print("the host of SyncFrom is already Primary, no need to change")
                        }
                        else
                        {
                                print("start command...replSetSyncFrom")        
                                db.adminCommand({replSetSyncFrom:priname}) 
                                sleep(5);
                                printjson(rs.status())
                        }
                }
        }
}
}