![]() ![]() The /opt/oracle/bda directory contains two files for executing commands on multiple servers: To change the target servers for the current command, use the -c or -g options described in Table 7-1. For a list of default target servers, use the -t option. You can identify the servers where you want the commands to run either in the command line or in a file. To remove passwordless SSH from root: remove-root-ssh In addition to dcli commands, you can use scp to copy files between servers. You can now run any ssh command on any server in the rack without entering a password. You see the message "ssh key added" from each server. Or, to set up passwordless SSH across a Hadoop cluster of multiple racks: setup-root-ssh -C Set up passwordless SSH for root across the rack: setup-root-ssh See Table 7-1 for details about these options.Ĭonnect to an Oracle Big Data Appliance server using PuTTY or a similar utility. g: Targets a user-defined set of servers C: Targets all the servers in a Hadoop cluster These scripts accept two options that are also used by dcli: Two scripts facilitate the use of SSH on Oracle Big Data Appliance: setup-root-ssh and remove-root-ssh. You run the dcli utility on the local server, and the commands specified in dcli execute on the target servers. If you want to authenticate the remote host connection using a keypair file, specify the path of the file using the -i flag.The dcli utility requires a passwordless Secure Shell (SSH) between the local server and all target servers. scp -q /home/document.txt Use a Keypair File for Authentication However, you can choose not to view this information using the -q flag. When you enter the scp command in order to transfer files, the terminal displays the progress bar and other related information on the screen. If you want to copy directories instead of files, use the -r flag to transfer directories recursively. scp -p /home/document.txt Copy Directories Notice that -P and -p flags are different from each other. ![]() If for any reason you want to preserve these timestamps, use the -p flag. When you transfer the file to another location using scp, the timestamps of the destination file are overridden by the current time. ![]() You might know that Linux sets timestamps for each file to store the modification time, access time, and change time associated with the file. To use some other port number while copying files from a local host to a remote host: scp -P 35 /home/document.txt aforementioned command will ensure that the scp command uses port 35 for transferring files. Also, the user should have write access to the directory in which you want to save the file.Īfter issuing the above-mentioned command, the system will ask you for the remote user's password. Keep in mind that the user must exist on the remote server if you want to transfer the files successfully. The destination path is separated from the remote host details using the colon character ( :). ![]() In the above command, user is the username and remote-host is the domain name. You have to specify the username and domain name of the remote server as well. And the destination is the path of the file on the remote host. To upload a file named document.txt to a remote host: scp /home/document.txt that the source is the path of the file on your local storage. If you are a server administrator, then transferring files between a local host and remote hosts might be useful to you. The basic syntax of the scp command is: scp Transfer From Local Host to a Remote System ![]()
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