'Host key verification failed' Error when scp from one host to another in linux

Problem

When Try to copy file from one host to another below error occur

[root@backup u01]# scp -r RPM_oel6/ 192.168.22.4:/u01
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
ea:d6:b9:ac:45:e5:4a:46:ff:71:0b:84:a6:24:de:b2.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:2
RSA host key for 192.168.22.4 has changed and you have requested strict checking.
Host key verification failed.
lost connection

Solution

Please execute below command and copy again to overcome the issue

sed -i '2d' /root/.ssh/known_hosts 

Where '2d' is line number. If the line number is different then use the same

Mount NTFS file system on Linux

Below are the steps to mount ntfs file system on linux OS

1. Download fuse RPM from below link and Install

http://www.atrpms.net/dist/el5/fuse/

$ rpm -Uvh --nodeps --force fuse-2.7.4-8_12.el5.x86_64.rpm
$ rpm -Uvh --nodeps --force fuse-kmdl-2.6.18-371.el5xen-2.7.4-8_12.el5.x86_64.rpm
$ rpm -Uvh --nodeps --force fuse-libs-2.7.4-8_12.el5.x86_64.rpm

2. Download fuse-ntfs RPM from below link and Install
http://dag.wieers.com/rpm/packages/fuse-ntfs-3g/

$ rpm -Uvh --nodeps --force fuse-ntfs-3g-1.417-1.el4.rf.x86_64.rpm

3. Mount the HD

$ mount.ntfs-3g /dev/sdb1 /media/disk1 -o force

Change sysman Password on 12c EM

Can not Change sysman password through sqlplus when running on Enterprise Manager. Have to use emctl to change sysman because this is used by oms. Please follow below steps to change the password

1. Stop oms

$ export OMS_HOME=/u01/app/oracle/oms12cr3/oms
$ cd $OMS_HOME/bin
$ ./emctl stop oms

do not use -all as admin server need to be up for change password 2. Modify sysman password

$ cd $OMS_HOME/bin
$ emctl config oms -change_repos_pwd -use_sys_pwd -sys_pwd <'sys password'> -new_pwd <'new sysman password'>

2. Restart all oms including Admin server

$ cd $OMS_HOME/bin
$ ./emctl stop oms -all
$ ./emctl start oms

Add Swap Space on Linux

Find current swap space on the system

# free -m
           total   used    free   shared   buffers  cached
Mem:       16051   15570    481      0       707     12644
-/+ buffers/cache: 2218    13833
Swap:      8189     0      8189

Or

# swapon -s
Filename         Type        Size    Used    Priority
/dev/sda2      partition   8385920    88       -1

 Or

# cat /proc/swaps
Filename         Type        Size    Used    Priority
/dev/sda2      partition   8385920    88       -1

Method 1 - Use Hard Drive Partition

If you have additional hard disk or space available in existing disk then create partition using fdisk command. Assume /dev/sdc1 is newly created partition 

Setup newly created partition as swap area

# mkswap /dev/sdc1

Enable swap partition

# swapon /dev/sdc1

Add following line to /etc/fstab to available even after reboot

# cat /etc/fstab
/dev/sdc1        swap         swap    defaults        0 0

Verify whether newly created swap space is available

# swapon -s
Filename         Type       Size     Used    Priority
/dev/sda2      partition   8385920    88       -1
/dev/sdc1      partition  10234430     0       -2

Method 2 - Use a file for Additional swap space

If you does not have any additional disk then you can create a file on your system and use that for swap space

Create the swap file called 'myswap' using following command (file size in bytes=bs*count)

# dd if=/dev/zero of=/root/myswap bs=1M count=2048

Change the permission of newly created file

# chmod 755 /root/myswap

Make this file as a swap file

# mkswap /root/myswap

Add following line to /etc/fstab to available even after reboot

# cat /etc/fstab
/root/myswap        swap         swap    defaults        0 0

Verify whether newly created swap space is available

# swapon -s
Filename         Type       Size     Used    Priority
/dev/sda2      partition   8385920    88       -1
/root/myswap     file      2097152     0       -2

Deploy 12c Management Agent

Here explain how to add target hosts to enterprise manager

Login to Enterprise Manager via Sysman login
Go to Setup->Add Target->Add Targets Manually

 Select Add Host Targets and Click Add Host Button

Click on Add Button and Add the target host name which need to deploy agent and Click on Next Button

Provide Installation Base Directory and Instance directory on target host

Review the Host Information and click on Deploy Agent button to begin the installation

Now Management Agent will deploy on target host

Ignore the Privileges warning and click on Continue->Continue, All Host

Run the root.sh to complete the Agent deployment

Go to Setup->Add Target->Add Targets Manually and select 'Add Target Declaratively by Specifying Target Monitoring Properties'
Select 'Database Instance' to Target Type and specific hostname for Monitoring Agent and click on 'Add Manually' Button

Provide Database Details of Agent and Test the connection

Agent configuration completed and now can monitor newly added DB through EM

Install 12c Enterprise Manager

Prerequisites 

Download and Install Oracle Database 11g R2 on linux platform

Download Enterprise Manager Cloud control from following link

http://www.oracle.com/technetwork/oem/grid-control/downloads/index.html

If you have performed a default database installation you will need to de-configure Enterprise Manager Database Control. Run the following command as the "oracle" user.

$ emca -deconfig dbcontrol db -repos drop -SYS_PWD <sys pasword> -SYSMAN_PWD <sysman password>

Make following initialization parameter changes and restart the instance

$sqlplus / AS SYSDBA
SQL>ALTER SYSTEM SET processes=300 SCOPE=SPFILE;
SQL>ALTER SYSTEM SET session_cached_cursors=200 SCOPE=SPFILE
SQL>ALTER SYSTEM SET sga_target=2G SCOPE=SPFILE;
SQL>ALTER SYSTEM SET shared_pool_size=600M SCOPE=SPFILE;
SQL>ALTER SYSTEM SET pga_aggregate_target=1G SCOPE=SPFILE;
SQL>ALTER SYSTEM SET job_queue_processes=20 SCOPE=SPFILE;

SQL>SHUTDOWN IMMEDIATE
SQL>STARTUP

If you have done a default installation as described here, the UNDO tablespace will be autoextensible. If you have done a custom installation make sure the UNDO tablespace is at least 200M in size. Also, make sure you have 3 redo logs of at least 300M to prevent a warning during the installation.

Cloud Control Installation

Create Following installation directories for management server and agent

$ mkdir -p /u01/app/oracle/oms12cr3
$ mkdir -p /u01/app/oracle/agent12cr3

Unzip the cloud control media and begin the installation by running runinstaller

$ mkdir em
$ unzip -d em em12103p1_linux64_disk1.zip
$ unzip -d em em12103p1_linux64_disk2.zip
$ unzip -d em em12103p1_linux64_disk3.zip
$ cd em

$ ./runInstaller

If you wish to receive support information enter the e-mail address else skip

If you wish to check for updates enter the details else skip

If you have completed all the prerequisites then installation pass all the checks

Select 'Create a new Enterprise Manager System' and 'simple' option

Enter Middleware and Agent installation locations

Enter Administrator password and Database Details

If you have any additional warnings, check they don't look like show-stoppers, then click the 'OK' button to continue and click 'Install' button to begin the installation

When prompted, run the root scripts, then click the 'OK' button
Make note of the URL below and close. Copy of following information are stored in /u01/app/oracle/oms12cr3/oms/install/setupinfo.txt file.

Login to the EM using above URL.

Startup and Shutdown Enterprise Manager

Oracle Management Server

export OMS_HOME=/u01/app/oracle/oms12cr3/oms
$OMS_HOME/bin/emctl start oms
$OMS_HOME/bin/emctl stop oms
$OMS_HOME/bin/emctl status oms

Agent

export AGENT_HOME=/u01/app/oracle/agent12cr3/core/12.1.0.3.0
$AGENT_HOME/bin/emctl start agent
$AGENT_HOME/bin/emctl stop agent
$AGENT_HOME/bin/emctl status agent

Migrate Non ASM to ASM Database - 11g

Prerequisite
Running Non ASM 11g Database

Migration Steps

Download and Install appropriate ASMLib RPM's

• oracleasm-support-2.1.7-1.el5.i386.rpm
• oracleasmlib-2.0.4-1.el5.i386.rpm
• oracleasm-[your-kernel-version].rpm

Then create the disk as follows which using creation of ASM instance

I have created 2 disks DISK1 and DISK2

Check the permission of created disk under /dev/oracleasm/disks/

Now unzip the grid software and install using ./runInstaller

And select 'Install and Configure Grid Infrastructure for Standalone Server' as we are not using ASM for RAC database.

Here you can able see the disks created earlier. I have kept the redundancy 'External' so that only one disk is required for a disk group. For redundancy 'Normal' we need to have a two disks in a diskgroup and for 'High' we need a minimum for three disks. Select the disk which has to be added to diskgroup named 'DATA'.

Provide the password for SYS and ASMSNMP

 Select the OS group or keep as It is

 Click Finish to begin the installation

Once the installation is completed you can check whether ASM processes are running

Now below are the steps to move Non ASM DB to ASM disks

SQL> select name from v$database;

NAME
---------
DEV

SQL> select file_name from dba_data_files;

FILE_NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/users01.dbf
/u01/app/oracle/oradata/DEV/undotbs01.dbf
/u01/app/oracle/oradata/DEV/sysaux01.dbf
/u01/app/oracle/oradata/DEV/system01.dbf
/u01/app/oracle/oradata/DEV/example01.dbf

SQL> select file_name from dba_temp_files;

FILE_NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/temp01.dbf


SQL> show parameter spfile;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
spfile                               string      /u01/app/oracle/product/11.2.0
                                                 /dbhome_1/dbs/spfileDEV.ora


SQL> show parameter control_file;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
control_file_record_keep_time        integer     7
control_files                        string      /u01/app/oracle/oradata/DEV/co
                                                 ntrol01.ctl, /u01/app/oracle/f
                                                 lash_recovery_area/DEV/control
                                                 02.ctl

SQL> alter system set control_files='+DATA' scope=spfile;

System altered.

SQL> alter system set db_create_file_dest='+DATA' scope=spfile;
 
System altered.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup nomount;
ORACLE instance started.

Total System Global Area 1653518336 bytes
Fixed Size                  2213896 bytes
Variable Size             956303352 bytes
Database Buffers          687865856 bytes
Redo Buffers                7135232 bytes

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options


[oracle@dev ~]$ rman target /

Recovery Manager: Release 11.2.0.1.0 - Production on Thu May 14 11:05:40 2015

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

connected to target database: DEV (not mounted)

RMAN> restore controlfile from '/u01/app/oracle/oradata/DEV/control01.ctl';

Starting restore at 14-MAY-15
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=23 device type=DISK

channel ORA_DISK_1: copied control file copy
output file name=+DATA/dev/controlfile/current.257.879678343
Finished restore at 14-MAY-15

RMAN> alter database mount;

database mounted
released channel: ORA_DISK_1

RMAN> backup as copy database format '+DATA'
2> ;

Starting backup at 14-MAY-15
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=25 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=/u01/app/oracle/oradata/DEV/system01.dbf
output file name=+DATA/dev/datafile/system.258.879679631 tag=TAG20150514T112711 RECID=2 STAMP=879679658
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:35
channel ORA_DISK_1: starting datafile copy
input datafile file number=00002 name=/u01/app/oracle/oradata/DEV/sysaux01.dbf
output file name=+DATA/dev/datafile/sysaux.259.879679667 tag=TAG20150514T112711 RECID=3 STAMP=879679687
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:25
channel ORA_DISK_1: starting datafile copy
input datafile file number=00003 name=/u01/app/oracle/oradata/DEV/undotbs01.dbf
output file name=+DATA/dev/datafile/undotbs1.260.879679691 tag=TAG20150514T112711 RECID=4 STAMP=879679697
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=/u01/app/oracle/oradata/DEV/example01.dbf
output file name=+DATA/dev/datafile/example.261.879679699 tag=TAG20150514T112711 RECID=5 STAMP=879679703
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
copying current control file
output file name=+DATA/dev/controlfile/backup.262.879679707 tag=TAG20150514T112711 RECID=6 STAMP=879679707
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=/u01/app/oracle/oradata/DEV/users01.dbf
output file name=+DATA/dev/datafile/users.263.879679709 tag=TAG20150514T112711 RECID=7 STAMP=879679709
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 14-MAY-15
channel ORA_DISK_1: finished piece 1 at 14-MAY-15
piece handle=+DATA/dev/backupset/2015_05_14/nnsnf0_tag20150514t112711_0.264.879679711 tag=TAG20150514T112711 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 14-MAY-15

RMAN> switch database to copy;

datafile 1 switched to datafile copy "+DATA/dev/datafile/system.258.879679631"
datafile 2 switched to datafile copy "+DATA/dev/datafile/sysaux.259.879679667"
datafile 3 switched to datafile copy "+DATA/dev/datafile/undotbs1.260.879679691"
datafile 4 switched to datafile copy "+DATA/dev/datafile/users.263.879679709"
datafile 5 switched to datafile copy "+DATA/dev/datafile/example.261.879679699"

RMAN> alter database open;

database opened

RMAN> Exit

SQL> select file_name from dba_data_files;

FILE_NAME
--------------------------------------------------------------------------------
+DATA/dev/datafile/users.263.879679709
+DATA/dev/datafile/undotbs1.260.879679691
+DATA/dev/datafile/sysaux.259.879679667
+DATA/dev/datafile/system.258.879679631
+DATA/dev/datafile/example.261.879679699

SQL> select file_name from dba_temp_files;

FILE_NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/temp01.dbf

SQL> alter database tempfile '/u01/app/oracle/oradata/DEV/temp01.dbf' drop including datafiles;

Database altered.

SQL> select file_name from dba_temp_files;

no rows selected

SQL> alter tablespace temp add tempfile size 300M;

Tablespace altered.

SQL> select file_name from dba_temp_files;

FILE_NAME
--------------------------------------------------------------------------------
+DATA/dev/tempfile/temp.265.879682295

SQL> select member from v$logfile;

MEMBER
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/redo03.log
/u01/app/oracle/oradata/DEV/redo02.log
/u01/app/oracle/oradata/DEV/redo01.log


SQL> alter database add logfile group 4 '+DATA' size 10M;

Database altered.

SQL> alter database add logfile group 5 '+DATA' size 10M;

Database altered.

SQL> alter database add logfile group 6 '+DATA' size 10M;

Database altered.

SQL> select member from v$logfile;

MEMBER
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/redo03.log
/u01/app/oracle/oradata/DEV/redo02.log
/u01/app/oracle/oradata/DEV/redo01.log
+DATA/dev/onlinelog/group_4.266.879682579
+DATA/dev/onlinelog/group_5.267.879682595
+DATA/dev/onlinelog/group_6.268.879682607

6 rows selected.


SQL> alter database drop logfile group 2;

Database altered.

SQL> alter database drop logfile group 3;

Database altered.

SQL> select member from v$logfile;

MEMBER
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/DEV/redo01.log
+DATA/dev/onlinelog/group_4.266.879682579
+DATA/dev/onlinelog/group_5.267.879682595
+DATA/dev/onlinelog/group_6.268.879682607

SQL>  

SQL> select group#,status from v$log;

    GROUP# STATUS
---------- ----------------
         1 ACTIVE
         4 ACTIVE
         5 CURRENT
         6 UNUSED

SQL> alter system switch logfile;

System altered.

SQL> select group#,status from v$log;

    GROUP# STATUS
---------- ----------------
         1 ACTIVE
         4 ACTIVE
         5 ACTIVE
         6 CURRENT


SQL> alter system checkpoint;

System altered.

SQL> select group#,status from v$log;

    GROUP# STATUS
---------- ----------------
         1 INACTIVE
         4 CURRENT
         5 INACTIVE
         6 INACTIVE

SQL> alter database drop logfile group 1;

Database altered.

SQL>