Centos SSH keys

[Shockey]

hello, I trying to setup a hadoop cluster here. I hit a bump in the road of trying to set it up it seems. when i try and copy the id_rsa.pub to authorized_keys says it doesn't exit. I go to the folder (.ssh) and it also doesn't show it.

i ran first.

ssh-keygen -t rsa

then

[hadoop@master .ssh]$ cat id_rsa.pub /home/hadoop/.ssh/authorized_keys
(key removed.)
cat: /home/hadoop/.ssh/authorized_keys: No such file or directory

Anyone shed some light on this and how to get this to work correctly.


Thanks in advance!

 

[keenan]

cat reads all files listed on its command line and dumps them to stdout. Your command is trying to read the authorized_keys file (which doesn't exist yet), not write to it. You probably meant to do:

cat id_rsa.pub > /home/hadoop/.ssh/authorized_keys

Which takes the stdout from cat and redirects it into the file.

 

[Shockey]

cat reads all files listed on its command line and dumps them to stdout. Your command is trying to read the authorized_keys file (which doesn't exist yet), not write to it. You probably meant to do:

cat id_rsa.pub > /home/hadoop/.ssh/authorized_keys

Which takes the stdout from cat and redirects it into the file.

I guess my copy and paste to putty didn't work correctly.

this is the original command from the tutorial

cat /home/hadoop/.ssh/id_rsa.pub >>  /home/hadoop/.ssh/authorized_keys

My laziness i guess got the better of me. Your code work out for me. Thank you for the quick reply and explaining it!

 

[keenan]

For future reference, >> is append, > will overwrite the existing file.

 

[Shockey]

For future reference, >> is append, > will overwrite the existing file.

Alright thank you.

Do you happen to know how to find where java is installed on centos system?

it came installed i beleive cause i ran yum update and seen it was being updated.

 

[keenan]

Alright thank you.

Do you happen to know how to find where java is installed on centos system?

it came installed i beleive cause i ran yum update and seen it was being updated.

Generally Linux is not like Windows, where programs are installed to a single directory. Java will likely have files all over the filesystem, though RedHat distros sometimes use /opt for things like Java, I'm not sure, I don't use them.

If you just want to know the path to the java binary, you can use 'which java'.

 

[Shockey]

Generally Linux is not like Windows, where programs are installed to a single directory. Java will likely have files all over the filesystem, though RedHat distros sometimes use /opt for things like Java, I'm not sure, I don't use them.

If you just want to know the path to the java binary, you can use 'which java'.

which java did the trick. I need it to run hadoop which is written in java.

Thanks for the help.