Hadoop 在 Centos7 下的单机布署(一). Standalone Operation

[root@much ~]# hostnamectl 
   Static hostname: much
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 33dc28f7e76c4903ad9b603b77e29a7c
           Boot ID: 8cfd2a8aec4f4235b4776f7cd2fdfdb1
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-514.21.1.el7.x86_64
      Architecture: x86-64
[root@much ~]# ip a 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:e3:df:87 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic enp0s3
       valid_lft 84190sec preferred_lft 84190sec
    inet6 fe80::2bb7:5b3:9584:d8eb/64 scope link 
       valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:d3:ec:e7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.207/24 brd 192.168.56.255 scope global enp0s8
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fed3:ece7/64 scope link 
       valid_lft forever preferred_lft forever
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN qlen 1000
    link/ether 52:54:00:16:5e:11 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
5: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast master virbr0 state DOWN qlen 1000
    link/ether 52:54:00:16:5e:11 brd ff:ff:ff:ff:ff:ff
[root@much ~]# uname -a 
Linux much 3.10.0-514.21.1.el7.x86_64 #1 SMP Thu May 25 17:04:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@much ~]# 

[root@much ~]# rpm  -qa | grep epel 
[root@much ~]# yum  list all | grep -i epel 
epel-release.noarch                        7-9                         extras   
[root@much ~]# yum  install epel-release.noarch 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.yun-idc.com
 * c7-media: 
 * extras: mirrors.163.com
 * updates: centos.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package epel-release.noarch 0:7-9 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================
 Package                  Arch               Version           Repository          Size
========================================================================================
Installing:
 epel-release             noarch             7-9               extras              14 k

Transaction Summary
========================================================================================
Install  1 Package

Total download size: 14 k
Installed size: 24 k
Is this ok [y/d/N]: y
Downloading packages:
epel-release-7-9.noarch.rpm                                      |  14 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : epel-release-7-9.noarch                                              1/1 
  Verifying  : epel-release-7-9.noarch                                              1/1 

Installed:
  epel-release.noarch 0:7-9                                                             

Complete!
[root@much ~]# 
[root@much ~]# rpm  -qa | grep epel 
epel-release-7-9.noarch
[root@much ~]# 
[root@much ~]# yum list all | grep -i java | grep -i  jdk
java-1.7.0-openjdk.x86_64               1:1.7.0.141-2.6.10.1.el7_3     @updates 
java-1.7.0-openjdk-headless.x86_64      1:1.7.0.141-2.6.10.1.el7_3     @updates 
java-1.8.0-openjdk.x86_64               1:1.8.0.131-3.b12.el7_3        @updates 
java-1.8.0-openjdk-headless.x86_64      1:1.8.0.131-3.b12.el7_3        @updates 
java-1.6.0-openjdk.x86_64               1:1.6.0.41-1.13.13.1.el7_3     updates  
java-1.6.0-openjdk-demo.x86_64          1:1.6.0.41-1.13.13.1.el7_3     updates  
java-1.6.0-openjdk-devel.x86_64         1:1.6.0.41-1.13.13.1.el7_3     updates  
java-1.6.0-openjdk-javadoc.x86_64       1:1.6.0.41-1.13.13.1.el7_3     updates  
java-1.6.0-openjdk-src.x86_64           1:1.6.0.41-1.13.13.1.el7_3     updates  
java-1.7.0-openjdk-accessibility.x86_64 1:1.7.0.141-2.6.10.1.el7_3     updates  
java-1.7.0-openjdk-demo.x86_64          1:1.7.0.141-2.6.10.1.el7_3     updates  
java-1.7.0-openjdk-devel.x86_64         1:1.7.0.141-2.6.10.1.el7_3     updates  
java-1.7.0-openjdk-javadoc.noarch       1:1.7.0.141-2.6.10.1.el7_3     updates  
java-1.7.0-openjdk-src.x86_64           1:1.7.0.141-2.6.10.1.el7_3     updates  
java-1.8.0-openjdk.i686                 1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk.x86_64               1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-accessibility.x86_64 1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-accessibility-debug.x86_64
java-1.8.0-openjdk-debug.i686           1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-debug.x86_64         1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-debuginfo.i686       1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-debuginfo.x86_64     1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-demo.x86_64          1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-demo-debug.x86_64    1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-devel.i686           1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-devel.x86_64         1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-devel-debug.i686     1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-devel-debug.x86_64   1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-headless.i686        1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-headless.x86_64      1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-headless-debug.i686  1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-headless-debug.x86_64
java-1.8.0-openjdk-javadoc.noarch       1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-javadoc-debug.noarch 1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-javadoc-zip.noarch   1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-javadoc-zip-debug.noarch
java-1.8.0-openjdk-src.x86_64           1:1.8.0.141-1.b16.el7_3        updates  
java-1.8.0-openjdk-src-debug.x86_64     1:1.8.0.141-1.b16.el7_3        updates  
ldapjdk-javadoc.noarch                  4.18-16.el7_3                  updates  
[root@much ~]# yum install java-1.8.0-openjdk.x86_64  java-1.8.0-openjdk-devel.x86_64  java-1.8.0-openjdk-headless.x86_64  
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.yun-idc.com
 * c7-media: 
 * epel: mirrors.ustc.edu.cn
 * extras: mirrors.163.com
 * updates: centos.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.131-3.b12.el7_3 will be updated
---> Package java-1.8.0-openjdk.x86_64 1:1.8.0.141-1.b16.el7_3 will be an update
---> Package java-1.8.0-openjdk-devel.x86_64 1:1.8.0.141-1.b16.el7_3 will be installed
---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.131-3.b12.el7_3 will be updated
---> Package java-1.8.0-openjdk-headless.x86_64 1:1.8.0.141-1.b16.el7_3 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================
 Package                        Arch      Version                      Repository  Size
========================================================================================
Installing:
 java-1.8.0-openjdk-devel       x86_64    1:1.8.0.141-1.b16.el7_3      updates    9.7 M
Updating:
 java-1.8.0-openjdk             x86_64    1:1.8.0.141-1.b16.el7_3      updates    234 k
 java-1.8.0-openjdk-headless    x86_64    1:1.8.0.141-1.b16.el7_3      updates     31 M

Transaction Summary
========================================================================================
Install  1 Package
Upgrade  2 Packages

Total download size: 41 M
Is this ok [y/d/N]: y
Downloading packages:
updates/7/x86_64/prestodelta                                     | 954 kB  00:00:00     
Delta RPMs reduced 234 k of updates to 58 k (75% saved)
(1/3): java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3_1.8.0.141-1.b16. |  58 kB  00:00:00     
(2/3): java-1.8.0-openjdk-devel-1.8.0.141-1.b16.el7_3.x86_64.rpm | 9.7 MB  00:00:03     
(3/3): java-1.8.0-openjdk-headless-1.8.0.141-1.b16.el7_3.x86_64. |  31 MB  00:00:03     
----------------------------------------------------------------------------------------
Total                                                       10 MB/s |  41 MB  00:04     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Updating   : 1:java-1.8.0-openjdk-headless-1.8.0.141-1.b16.el7_3.x86_64           1/5 
warning: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre/lib/security/java.security created as /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre/lib/security/java.security.rpmnew
  Updating   : 1:java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64                    2/5 
  Installing : 1:java-1.8.0-openjdk-devel-1.8.0.141-1.b16.el7_3.x86_64              3/5 
  Cleanup    : 1:java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64                    4/5 
  Cleanup    : 1:java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64           5/5 
  Verifying  : 1:java-1.8.0-openjdk-headless-1.8.0.141-1.b16.el7_3.x86_64           1/5 
  Verifying  : 1:java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64                    2/5 
  Verifying  : 1:java-1.8.0-openjdk-devel-1.8.0.141-1.b16.el7_3.x86_64              3/5 
  Verifying  : 1:java-1.8.0-openjdk-1.8.0.131-3.b12.el7_3.x86_64                    4/5 
  Verifying  : 1:java-1.8.0-openjdk-headless-1.8.0.131-3.b12.el7_3.x86_64           5/5 

Installed:
  java-1.8.0-openjdk-devel.x86_64 1:1.8.0.141-1.b16.el7_3                               

Updated:
  java-1.8.0-openjdk.x86_64 1:1.8.0.141-1.b16.el7_3                                     
  java-1.8.0-openjdk-headless.x86_64 1:1.8.0.141-1.b16.el7_3                            

Complete!
[root@much ~]# 

[root@much ~]# java -version
openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-b16)
OpenJDK 64-Bit Server VM (build 25.141-b16, mixed mode)
[root@much ~]# which java 
/usr/bin/java
[root@much ~]# ll /usr/bin/java
lrwxrwxrwx. 1 root root 22 8月   6 23:55 /usr/bin/java -> /etc/alternatives/java
[root@much ~]# ll /etc/alternatives/java
lrwxrwxrwx. 1 root root 73 8月   6 23:55 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre/bin/java
[root@much ~]# ll /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre/bin/java
-rwxr-xr-x. 1 root root 7336 7月  21 06:37 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre/bin/java
[root@much ~]# ll /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/
total 4
drwxr-xr-x. 2 root root 4096 8月   6 23:55 bin
drwxr-xr-x. 3 root root  132 8月   6 23:55 include
drwxr-xr-x. 4 root root   28 8月   6 23:55 jre
drwxr-xr-x. 3 root root  144 8月   6 23:55 lib
drwxr-xr-x. 2 root root  204 8月   6 23:55 tapset
[root@much ~]# ll /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/bin/
total 420
-rwxr-xr-x. 1 root root   7400 7月  21 06:37 appletviewer
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 extcheck
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 idlj
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jar
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 jarsigner
-rwxr-xr-x. 1 root root   7336 7月  21 06:37 java
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 javac
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 javadoc
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 javah
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 javap
-rwxr-xr-x. 1 root root   2806 7月  21 06:01 java-rmi.cgi
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jcmd
-rwxr-xr-x. 1 root root   7416 7月  21 06:37 jconsole
-rwxr-xr-x. 1 root root   7400 7月  21 06:37 jdb
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jdeps
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jhat
-rwxr-xr-x. 1 root root   7448 7月  21 06:37 jinfo
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jjs
-rwxr-xr-x. 1 root root   7448 7月  21 06:37 jmap
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jps
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 jrunscript
-rwxr-xr-x. 1 root root   7408 7月  21 06:37 jsadebugd
-rwxr-xr-x. 1 root root   7456 7月  21 06:37 jstack
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 jstat
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 jstatd
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 keytool
-rwxr-xr-x. 1 root root   7400 7月  21 06:37 native2ascii
-rwxr-xr-x. 1 root root   7456 7月  21 06:37 orbd
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 pack200
-rwxr-xr-x. 1 root root   7400 7月  21 06:37 policytool
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 rmic
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 rmid
-rwxr-xr-x. 1 root root   7400 7月  21 06:37 rmiregistry
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 schemagen
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 serialver
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 servertool
-rwxr-xr-x. 1 root root   7464 7月  21 06:37 tnameserv
-rwxr-xr-x. 1 root root 103424 7月  21 06:37 unpack200
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 wsgen
-rwxr-xr-x. 1 root root   7392 7月  21 06:37 wsimport
-rwxr-xr-x. 1 root root   7384 7月  21 06:37 xjc
[root@much ~]#

[root@much ~]# yum install openssh rsync 
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.yun-idc.com
 * c7-media: 
 * epel: mirrors.ustc.edu.cn
 * extras: mirrors.163.com
 * updates: centos.ustc.edu.cn
Package openssh-6.6.1p1-35.el7_3.x86_64 already installed and latest version
Package rsync-3.0.9-17.el7.x86_64 already installed and latest version
Nothing to do
[root@much ~]#

[root@much ~]# getenforce 
Enforcing
[root@much ~]# setenforce  0 
[root@much ~]# getenforce 
Permissive
[root@much ~]#

[root@much ~]# useradd hadoop 
[root@much ~]# passwd hadoop
Changing password for user hadoop.
New password: 
BAD PASSWORD: The password is shorter than 8 characters
Retype new password: 
passwd: all authentication tokens updated successfully.
[root@much ~]# 

[root@much ~]# su - hadoop 
[hadoop@much ~]$ ssh-keygen -t rsa -P ""
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): 
Created directory '/home/hadoop/.ssh'.
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
cb:02:3a:db:ce:eb:e3:d0:72:be:54:84:8f:cb:d7:c1 hadoop@much
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|     .           |
|    . .          |
|     + .         |
|    o o E        |
|   + + o o       |
|  = * o +        |
|   @.. .         |
|  .+X+           |
+-----------------+
[hadoop@much ~]$ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys
[hadoop@much ~]$ chmod 600 $HOME/.ssh/authorized_keys
[hadoop@much ~]$ ssh localhost
The authenticity of host 'localhost (::1)' can't be established.
ECDSA key fingerprint is 0c:52:20:0a:00:e3:1a:5d:c6:fc:79:b3:e8:6e:d6:f1.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Last login: Mon Aug  7 00:04:13 2017
[hadoop@much ~]$ exit
logout
Connection to localhost closed.
[hadoop@much ~]$ ssh localhost
Last login: Mon Aug  7 00:05:48 2017 from localhost
[hadoop@much ~]$ exit
logout
Connection to localhost closed.
[hadoop@much ~]$ 

[hadoop@much ~]$ ssh -vvv localhost
OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [::1] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/hadoop/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/hadoop/.ssh/id_rsa type 1
debug1: identity file /home/hadoop/.ssh/id_rsa-cert type -1
debug1: identity file /home/hadoop/.ssh/id_dsa type -1
debug1: identity file /home/hadoop/.ssh/id_dsa-cert type -1
debug1: identity file /home/hadoop/.ssh/id_ecdsa type -1
debug1: identity file /home/hadoop/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/hadoop/.ssh/id_ed25519 type -1
debug1: identity file /home/hadoop/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
debug1: match: OpenSSH_6.6.1 pat OpenSSH_6.6.1* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "localhost" from file "/home/hadoop/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/hadoop/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-ed25519,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: setup hmac-md5-etm@openssh.com
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug2: mac_setup: setup hmac-md5-etm@openssh.com
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: curve25519-sha256@libssh.org need=16 dh_need=16
debug1: kex: curve25519-sha256@libssh.org need=16 dh_need=16
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA 0c:52:20:0a:00:e3:1a:5d:c6:fc:79:b3:e8:6e:d6:f1
debug3: load_hostkeys: loading entries for host "localhost" from file "/home/hadoop/.ssh/known_hosts"
debug3: load_hostkeys: found key type ECDSA in file /home/hadoop/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug1: Host 'localhost' is known and matches the ECDSA host key.
debug1: Found key in /home/hadoop/.ssh/known_hosts:1
debug1: ssh_ecdsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/hadoop/.ssh/id_rsa (0x7f284841f2c0),
debug2: key: /home/hadoop/.ssh/id_dsa ((nil)),
debug2: key: /home/hadoop/.ssh/id_ecdsa ((nil)),
debug2: key: /home/hadoop/.ssh/id_ed25519 ((nil)),
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyex
debug3: remaining preferred: gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyex
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:1001)

debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:1001)

debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/hadoop/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp cb:02:3a:db:ce:eb:e3:d0:72:be:54:84:8f:cb:d7:c1
debug3: sign_and_send_pubkey: RSA cb:02:3a:db:ce:eb:e3:d0:72:be:54:84:8f:cb:d7:c1
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
Authenticated to localhost ([::1]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: packet_set_tos: set IPV6_TCLASS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env HOSTNAME
debug3: Ignored env SHELL
debug3: Ignored env TERM
debug3: Ignored env HISTSIZE
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env MAIL
debug3: Ignored env PATH
debug3: Ignored env PWD
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env HISTCONTROL
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env LOGNAME
debug3: Ignored env LESSOPEN
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
Last login: Mon Aug  7 00:05:55 2017 from localhost
[hadoop@much ~]$ 

[root@much ~]# sysctl -a | grep -i net.ipv6.conf.all.disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 0
[root@much ~]# cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
[root@much ~]#
[root@much ~]# vim  /etc/sysctl.conf
[root@much ~]# sysctl -p 
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
[root@much ~]# sysctl -a | grep -i net.ipv6.conf.all.disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 1
[root@much ~]# 
[root@much ~]# cat /etc/sysctl.conf
# sysctl settings are defined through files in
# /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/.
#
# Vendors settings live in /usr/lib/sysctl.d/.
# To override a whole file, create a new file with the same in
# /etc/sysctl.d/ and put new settings there. To override
# only specific settings, add a file with a lexically later
# name in /etc/sysctl.d/ and put new settings there.
#
# For more information, see sysctl.conf(5) and sysctl.d(5).

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

[root@much ~]# 
[root@much ~]#  cat /proc/sys/net/ipv6/conf/all/disable_ipv6
1
[root@much ~]#