Use the Configure Linux (Ubuntu) commands that are commonly used in Hadoop

Generate key:$ ssh-keygen-t Dsa-p "-F ~/.ssh/id_dsa$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keysthe -t key type can be specified with the-t option. If not specified, the RSA key for SSH-2 is generated by default. -f filename Specifies the key file name. Source: http://www.aboutyun.com/thread-6487-1-1.html Remote Login Execution shell command keySSH telnet and create the file remotely

SSH [email protected] ' mkdir-p. SSH && cat >>. Ssh/authorized_keys ' < ~/.ssh/id_rsa.pub

Source: http://www.aboutyun.com/thread-6977-1-1.html Remote ReplicationSCP Authorized_keys [email protected]:~/.ssh/authorized_keys_from_yangsudo scp-r/usr/hadoop [email protected]:~/ File Append contentCat Authorized_keys_from_yang >> Authorized_keys Unpack the package:sudo tar zxvf./jdk-7-linux-i586.tar.gz-c/USR/LIB/JVM file copy: (JDK copied to opt ) sudo cp-r jdk//opt file Movesudo mvJDK opt( sometimes without permission, so you have to add sudo)  File Change owner (below is the right to change the Hadoop folder)sudo chown-r Aboutyun:aboutyun Hadoop See if the port is being taken upsudo netstat-ap | grep 8080sudo netstat-ant|grep 3306 Proto recv-q send-q Local address Foreign Address State PID/PR Ogram name TCP 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1651/mysqld meaning of the expressionThe default port for MySQL is 3306 open 0.0.0.0 represents your local network address after a connection for the external network address, there is a real IP address. Hadoop Start DebuggingOpen DEBUG Export hadoop_root_logger=debug,console Linux Packaging CommandsTar czvf my.tar.gz hadoop-2.4.0-src Kill a processKill Process Numberkill-9 Process Number Rpm-qa|grep Softnamethe meaning of the expression is:is to check out Softname software from the installed software.Here's how the Grep content object represents looking up "content" from "Objects" and printing|Pipe symbol, the output of the previous command (that is, the result) as input to the next commandRpm-qaRPM Management Command queries all installed softwareSoRpm-qa|grep Softnameis to check out Softname software from the installed software.   hive installation MySQL common commands   See if the software is installedNetstat-tap | grep MySQL To test MySQL remote connection success:mysql-h172.16.77.15-uroot-p123 mysql-h host address-u user name-P user Password View Character SetsShow variables like '%char% '; To Modify a character set:VI/ETC/MY.CNF add Default-character-set=utf8 under [client] create sudo without password loginTo set the Aboutyun user with no password sudo permissions: Chmode u+w/etc/sudoersaboutyun all= (root) nopasswd:allchmod u-w/etc/sudoers test: sudo ifconfig Ubuntu View Service List codesudo service--status-allsudo initctl list To view the file size:Du-sh HADOOP-2.7.0-SRC Pack ZipZip-r myfile.zip./*

Use the Configure Linux (Ubuntu) commands that are commonly used in Hadoop