1.Cloudera Manager在線安裝你認為有什么優點和缺點?
2.Cloudera Manager安裝過程中遇到,你認為該如何解決?
3.在線安裝 addr.arpa domain name pointer localhost出現這個問題該如何解決?

安裝過程中,由於網絡終端,導致下面問題:
問題1:安裝停止在獲取安裝鎖
/tmp/scm_prepare_node.tYlmPfrT
using SSH_CLIENT to get the SCM hostname: 172.16.77.20 33950 22
opening logging file descriptor
正在啟動安裝腳本... 正在獲取安裝鎖... BEGIN flock 4

問題2:不能選擇主機
安裝失敗了,重新不能選主機

圖1
解決方案,需要清理安裝失敗文件
卸載 Cloudera Manager 5.1.x.和 相關軟件【官網翻譯:高可用】

問題3:DNS反向解析PTR localhost:
描述:
DNS反向解析錯誤,不能正確解析Cloudera Manager Server主機名
日志:
解決方案:
將連不上的機器 /usr/bin/host 文件刪掉,執行下面命令:
說明:不明白cloudera的初衷,這里已經得到 Cloudera Manager Server的ip了,卻還要把ip解析成主機名來連接由於DNS反向解析沒有配置好,根據Cloudera Manager Server 的ip解析主機名卻得到了localhost,造成之后的連接錯誤這里的解決方案是直接把/usr/bin/host刪掉,這樣Cloudera Manager就會直接使用 ip進行連接,就沒有錯了參考:

問題 4 NTP:
問題描述:
Bad Health --Clock Offset
The host's NTP service did not respond to a request for the clock offset.
解決:
配置NTP服務
步驟參考:
CentOS配置NTP Server:
http://www.hailiangchen.com/centos-ntp/
國內常用NTP服務器地址及IP
http://www.douban.com/note/171309770/
修改配置文件:
[root@work03 ~]# vim /etc/ntp.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool ( http://www.pool.ntp.org/join.html).
server s1a.time.edu.cn prefer
server s1b.time.edu.cn
server s1c.time.edu.cn
restrict 172.16.1.0 mask 255.255.255.0 nomodify <===放行局域網來源
啟動ntp
#service ntpd restart <===啟動ntp服務
客戶端同步時間(work02,work03):
ntpdate work01
說明:NTP服務啟動需要大約五分鍾時間,服務啟動之前,若客戶端同步時間,則會出現錯誤“no server suitable for synchronization found”
定時同步時間:
在work02和 work03上配置crontab定時同步時間
crontab -e
00 12 * * * root /usr/sbin/ntpdate 192.168.56.121 >> /root/ntpdate.log 2>&1
問題 2.2
描述:
Clock Offset
- Ensure that the host's hostname is configured properly.
- Ensure that port 7182 is accessible on the Cloudera Manager Server (check firewall rules).
- Ensure that ports 9000 and 9001 are free on the host being added.
問題定位:
- Check agent logs in /var/log/cloudera-scm-agent/ on the host being added (some of the logs can be found in the installation details).
解決:
在對應host(work02、work03)上運行 'ntpdc -c loopinfo'
[root@work03 work]# ntpdc -c loopinfo
ntpdc: read: Connection refused
開啟ntp服務:
三台機器都開機啟動 ntp服務
chkconfig ntpd on

問題 5 heartbeat:
錯誤信息:
Installation failed. Failed to receive heartbeat from agent.
解決:關閉防火牆
centos7.0(默認是使用firewall作為防火牆,如若未改為iptables防火牆,使用以下命令查看和關閉防火牆)
查看防火牆狀態:firewall-cmd --state
關閉防火牆:systemctl stop firewalld.service

問題 6 Unknow Health:
Unknow Health
重啟后:Request to theHost Monitor failed.
service --status-all| grep clo
機器上查看scm-agent狀態:cloudera-scm-agent dead but pid file exists
解決:重啟服務
service cloudera-scm-agent restartservice cloudera-scm-server restart

問題 7 canonial name hostname consistent:
Bad HealthThe hostname and canonical name for this host are not consistent when checked from a Java process.canonical name:4092 Monitor-HostMonitor throttling_logger WARNING (29 skipped) hostname work02 differs from the canonical name work02.xinzhitang.com解決:修改hosts 使FQDN和 hostname相同ps:雖然解決了但是不明白為什么主機名和主機別名要一樣/etc/hosts192.168.1.185 work01 work01192.168.1.141 work02 work02192.168.1.198 work03 work03

問題 8 Concerning Health:
Concerning Health Issue-- Network Interface Speed --描述:The host has 2 network interface(s) that appear to be operating at less than full speed. Warning threshold: any.詳細:This is a host health test that checks for network interfaces that appear to be operating at less than full speed.
A failure of this health test may indicate that network interface(s) may be configured incorrectly and may be causing performance problems. Use the ethtool command to check and configure the host's network interfaces to use the fastest available link speed and duplex mode.
解決:本次測試修改了 Cloudera Manager 的配置,應該不算是真正的解決
Cloudera 建議將 /proc/sys/vm/swappiness 設置為 0。當前設置為 60。使用 sysctl 命令在運行時更改該設置並編輯 /etc/sysctl.conf 以在重啟后保存該設置。您可以繼續進行安裝,但可能會遇到問題,Cloudera Manager 報告您的主機由於交換運行狀況不佳。以下主機受到影響:
-
echo 0 > /proc/sys/vm/swappiness
1.查看你的系統里面的swappiness
$ cat /proc/sys/vm/swappiness
不出意外的話,你應該看到是 60
2.修改swappiness值為10
$ sudo sysctl vm.swappiness=10
但是這只是臨時性的修改,在你重啟系統后會恢復默認的60,所以,還要做一步:
$ gksudo gedit /etc/sysctl.conf
在這個文檔的最后加上這樣一行:
vm.swappiness=10
問題10:
-
rm /var/lib/cloudera-scm-agent/*
問題11:
Failed to create Oozie database.
rm -rf /var/lib/oozie/*
drop database oozie on postgresql
scm數據庫的用戶名,密碼
more /etc/cloudera-scm-server/db.properties
其他數據庫(如amon,hmon,smon,rman,nav)的用戶名、密碼
more /etc/cloudera-scm-server/db.mgmt.properties
數據庫管理者(相當於oracle DBA)cloudera-scm的用戶名、密碼
/var/lib/cloudera-scm-server-db/data/generated_password.txt
hive數據庫的用戶名、密碼
You can find the databaes admin(cloudera-scm) password in /var/lib/cloudera-scm-server-db/data/generated_password.txt.
針對數據庫的管理
1:連接數據庫
psql --host=localhost --port=7432 --username=scm --dbname=postgres -v ON_ERROR_STOP=1
psql --host=localhost --port=7432 --username=hmon --dbname=hmon -v ON_ERROR_STOP=1
psql --host=localhost --port=7432 --username=hive --dbname=hive -v ON_ERROR_STOP=1
psql --host=localhost --port=7432 --username=cloudera-scm -W=Cl5y3a3i6C --dbname=postgres -v ON_ERROR_STOP=1
輸入用戶口令后即可進入數據庫
顯示數據庫列表 \l
切換數據庫\c test
退出 \q
列表表、視圖、序列 \d
2:數據查詢
注意在查看hive數據庫中表中的數據時,可以由於hive數據庫在建表時,表的定義使用了大小寫混合拼寫的方式,在PostgreSQL中使用雙引號來界定標識符使您的具體大小寫混合的拼寫。否則會報下圖中的錯誤:
ERROR: relation "dbs" does not exist
3、數據導出
pg_dump -h localhost -p 7432 -U scm > /tmp/scm_server_db_backup.$(date +%Y%m%d)
1. 下載mysql的repo源
$ wget http://repo.mysql.com/mysql-community-release-el7-7.noarch.rpm
2. 安裝mysql-community-release-el7-5.noarch.rpm包
$ sudo rpm -ivh mysql-community-release-el7-7.noarch.rpm
安裝這個包后,會獲得兩個mysql的yum repo源:/etc/yum.repos.d/mysql-community.repo,/etc/yum.repos.d/mysql-community-source.repo。
3. 安裝mysql
$ sudo yum install mysql-server
根據步驟安裝就可以了,不過安裝完成后,沒有密碼,需要重置密碼。
來源: http://www.mamicode.com/info-detail-503994.html
4、 install the MySQL connector on a RHEL system:
sudo yum install mysql-connector-java
service mysqld start
sudo /usr/bin/mysql_secure_installation
6、To make sure the MySQL server starts at boot:
- On RHEL systems:
$ sudo /sbin/chkconfig mysqld on $ sudo /sbin/chkconfig --list mysqld mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off
mysql -u root -p
mysql> CREATE USER 'hive'@'metastorehost' IDENTIFIED BY 'mypassword';
...
mysql> REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'hive'@'metastorehost';
mysql> GRANT ALL PRIVILEGES ON metastore.* TO 'hive'@'metastorehost';
mysql> FLUSH PRIVILEGES;
mysql> quit;
sudo -u hdfs hadoop jar /opt/cloudera/parcels/CDH/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar pi 10 100
The "Getting Started with Hadoop" Tutorial
>Install htop on CentOS 7
First, enable the epel release on CentOS 7.
yum -y install epel-release
Now we can install CentOS htop using yum install command.
yum -y install htop