About SSH No key mutual login encountered problems

The main operation of this writing is very detailed: http://space.itpub.net/26686207/viewspace-742502, excerpt as follows:

Setting up SSH for H1 H2 H4

H4

[Grid@h4 ~]$ ssh-keygen-t RSA uses RSA encryption algorithm to generate key pair

Generating public/private RSA key pair. A public key and a private key

Enter file in which to save the key (/HOME/GRID/.SSH/ID_RSA):

Created directory '/home/grid/.ssh '.

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved In/home/grid/.ssh/id_rsa. This is the private key.

Your public key has been saved in/home/grid/.ssh/id_rsa.pub. This is the public key.

The key fingerprint is:

50:29:8A:78:AC:0E:A1:72:10:2D:01:66:77:F0:7E:C1 Grid@h4

The key ' s Randomart image is:rsa random graph

+--[RSA 2048]----+

|+= O..      .. |

|= o O.. |

| = . O.E |

|+ + O.. |

|. =  . . S |

|= .         . |

|+. |

| . |

| |

+-----------------+

[Grid@h4 ~]$ Ll–lrta as long as the home directory is generated. SSH hidden directory even if it succeeds

Total dosage

-rw-r--r--. 1 grid Hadoop 500 January. Emacs

Drwxr-xr-x. 2 grid Hadoop 4096 November. gnome2

-rw-r--r--. 1 grid Hadoop 124 May BASHRC

-rw-r--r--. 1 grid Hadoop 176 May Bash_profile

-rw-r--r--. 1 grid Hadoop 18 May bash_logout

Drwxr-xr-x. 4 root root 4096 September 1 21:14..

DRWX------. 5 grid Hadoop 4096 September 1 21:34.

DRWX------. 2 grid Hadoop 4096 September 1 21:34. SSH

Drwxr-xr-x. 4 grid Hadoop 4096 September 2. Mozilla

[Grid@h4 ~]$ CD. SSH

[Grid@h4. ssh]$ ll

Total Dosage 8

-RW-------. 1 grid Hadoop 1675 September 1 21:34 id_rsa

-rw-r--r--. 1 grid Hadoop 389 September 1 21:34 id_rsa.pub

[Grid@h4. ssh]$ CP id_rsa.pub Authorized_keys Generate authorization file

[Grid@h4. ssh]$ Cat Authorized_keys Open Authorized_keys View the public key inside

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqear6+d01kkqemurkyakulv3su+9ru+jj6snjmlydxfq38ogbsjbwcskvl/i9ds7ve5g7cop+ cmzgtryj1ns+elgf0g3/uhtserad4qdwxvlzgujyuxijkm+ni3ssdwlihzsnngh4gzekx3hqah/7s+rlozsbpi// w9hyfo6vexdo7n2lkvuxnw2z/h7juypmeqiaoiwaelk7ajxhjjaejkzh/ ccguex4ublrxqce5zjbnsfapod2bact1w80a7mrgzan3cvcquqpzmpdj750negxmtai+qrmpdlsx2zxtbari4opsvmbiqpy84pj/ h9m5wptq3hg/1xixv4gyqwlsxzw== Grid@h4

With this public key and with the private key, we'll be able to password-free login.

H2

[Grid@h2 ~]$ ssh-keygens-t RSA

-bash:ssh-keygens:command not found

[Grid@h2 ~]$ ssh-keygen-t RSA

Generating public/private RSA key pair.

Enter file in which to save the key (/HOME/GRID/.SSH/ID_RSA):

Created directory '/home/grid/.ssh '.

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved In/home/grid/.ssh/id_rsa.

Your public key has been saved in/home/grid/.ssh/id_rsa.pub.

The key fingerprint is:

14:55:b9:d1:4a:60:a1:5c:47:37:30:49:09:aa:30:3d GRID@H2

The key ' s Randomart image is:rsa random graph each is not the same

+--[RSA 2048]----+

| .. Bbb*o |

| . . *. *o. |

| o E =. +  |

| O + O |

| . S |

| |

| |

| |

| |

+-----------------+

[Grid@h2 ~]$ CD. SSH

[GRID@H2. ssh]$ ll

Total Dosage 12

-RW-------. 1 grid Hadoop 1675 September 1 21:59 Id_rsa also generated private keys and public keys

-rw-r--r--. 1 grid Hadoop 389 September 1 21:59 id_rsa.pub

H4

[Grid@h4. ssh]$ SCP Authorized_keys h2:/home/grid/.ssh/H4 's authorization file->h2

H2

[GRID@H2. ssh]$ ll

Total Dosage 12

-rw-r--r--. 1 grid Hadoop 778 September 1 22:02 authorized_keys

-RW-------. 1 grid Hadoop 1675 September 1 21:59 id_rsa

-rw-r--r--. 1 grid Hadoop 389 September 1 21:59 id_rsa.pub

[Grid@h2. ssh]$ Cat Authorized_keys

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqear6+d01kkqemurkyakulv3su+9ru+jj6snjmlydxfq38ogbsjbwcskvl/i9ds7ve5g7cop+ cmzgtryj1ns+elgf0g3/uhtserad4qdwxvlzgujyuxijkm+ni3ssdwlihzsnngh4gzekx3hqah/7s+rlozsbpi// w9hyfo6vexdo7n2lkvuxnw2z/h7juypmeqiaoiwaelk7ajxhjjaejkzh/ ccguex4ublrxqce5zjbnsfapod2bact1w80a7mrgzan3cvcquqpzmpdj750negxmtai+qrmpdlsx2zxtbari4opsvmbiqpy84pj/ h9m5wptq3hg/1xixv4gyqwlsxzw== Grid@h4

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqea5ikgfogkh3d8byr4vkknaetzkxcbbzbn6pfd0n3h82/ 1f9pwett4cegqzbssyvq2nbc6duy2nbdd9j5diwqens/fajdwccdijjeymo5+ o4ocpabx6ovm0r9nsukyu7bxehjap3zumcc1uvgw5asosrml7epcze+rnt5d5ldz+vokh0ngty2/ cst8qxhmedfzfbqsehipf5lh4a6osorhtfqbdn4apvf5s7cm5/ngpiyhu+ Kbhbz96pncxkjuowj69a7kx4agqyjoyc0t9o6yfjfvy3l1a7n2aj6jp4smv0gaohgzirbnxwofk6skuyf10yixvnlgzkhtyk9gs9hjjw

See now the authorization file already has the public key of H4 and H2, the difference H1

H1

[Grid@h1 ~]$ ssh-keygen-t RSA

Generating public/private RSA key pair.

Enter file in which to save the key (/HOME/GRID//.SSH/ID_RSA):

Enter passphrase (empty for no passphrase):

Enter same Passphrase again:

Your identification has been saved In/home/grid//.ssh/id_rsa.

Your public key has been saved in/home/grid//.ssh/id_rsa.pub.

The key fingerprint is:

B6:4E:A6:05:D3:37:E7:3D:CA:44:7B:CF:2C:D2:5B:A4 GRID@H1

The key ' s Randomart image is:

+--[RSA 2048]----+

| |

| |

| |

|        . |

| o S o O. |

| + o = o O |

| =  +. E. |

| * o.oo* |

| .  . O.. o+|

+-----------------+

H2

[GRID@H2. ssh]$ SCP Authorized_keys h1:/home/grid/.ssh/

H1

[GRID@H1. ssh]$ ll

Total Dosage 12

-rw-r--r--. 1 grid Hadoop 778 September 1 22:12 authorized_keys

-RW-------. 1 grid Hadoop 1675 September 1 22:12 id_rsa

-rw-r--r--. 1 grid Hadoop 389 September 1 22:12 id_rsa.pub

[Grid@h1. ssh]$ cat id_rsa.pub >> authorized_keys Copy the public key of three nodes to a file

[Grid@h1. ssh]$ Cat Authorized_keys

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqear6+d01kkqemurkyakulv3su+9ru+jj6snjmlydxfq38ogbsjbwcskvl/i9ds7ve5g7cop+ cmzgtryj1ns+elgf0g3/uhtserad4qdwxvlzgujyuxijkm+ni3ssdwlihzsnngh4gzekx3hqah/7s+rlozsbpi// w9hyfo6vexdo7n2lkvuxnw2z/h7juypmeqiaoiwaelk7ajxhjjaejkzh/ ccguex4ublrxqce5zjbnsfapod2bact1w80a7mrgzan3cvcquqpzmpdj750negxmtai+qrmpdlsx2zxtbari4opsvmbiqpy84pj/ h9m5wptq3hg/1xixv4gyqwlsxzw== Grid@h4

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqea5ikgfogkh3d8byr4vkknaetzkxcbbzbn6pfd0n3h82/ 1f9pwett4cegqzbssyvq2nbc6duy2nbdd9j5diwqens/fajdwccdijjeymo5+ o4ocpabx6ovm0r9nsukyu7bxehjap3zumcc1uvgw5asosrml7epcze+rnt5d5ldz+vokh0ngty2/ cst8qxhmedfzfbqsehipf5lh4a6osorhtfqbdn4apvf5s7cm5/ngpiyhu+ kbhbz96pncxkjuowj69a7kx4agqyjoyc0t9o6yfjfvy3l1a7n2aj6jp4smv0gaohgzirbnxwofk6skuyf10yixvnlgzkhtyk9gs9hjjw== Grid@h2

Ssh-rsa aaaab3nzac1yc2eaaaabiwaaaqea5v1lyss14a8awfektk/abgkhflmx/xzx/xtxvuqjl8nktqvlq37+ Xlyqvtfrcjsja70diqb3trwbp3k5exnxp3eor6eghsi0b6d8owsg0bcdhxhghu8rx8wb4dh9uov1upl5besaphjuemquqaqzlagqrnxbrkix8czdiegmnokny is49q9msnzawqo3luqfru7mqvau9uzqkxotrnzhqh0tgjj3sq6o6nsca7w//xmb0jgobvqafcdjqdn/ z1koq7e5wnhva8ynf9gof7cmdppug7ibw1rz9cka+igi1khhavs5h7xcm64nugfc87aqe9nz0yss3kh8pt5h6zlxfw== GRID@H1

[GRID@H1. ssh]$ SCP Authorized_keys h2:/home/grid/.ssh/passed to H2

[GRID@H1. ssh]$ SCP Authorized_keys h4:/home/grid/.ssh/passed to H4

Follow-up meets two questions:

Solution Agent admitted failure to sign using the key problem with SSH

Configuring SSH

Before installing SSH on this machine, you can install it via sudo apt-get install SSH or via new. If it is not configured, logging on to the local computer or the remote host requires a password for that host. Below is a password-free login configuration:

  Very simple, execute ssh-keygen-t RSA command, all the way to enter the line, in the. SSH folder generated 2 files, a public key and a private key file,  id_rsa  id_rsa.pub , Then execute cp  ~/.ssh/id_rsa