狂暴綿羊完勝企鵝教戰手冊

Senario:
oracle alert log shows
Errors in file $ORACLE_ALERT/trace/<SID>_reco_<pid>.trc:
ORA-12154: TNS:could not resolve the connect identifier specified

Senario: login by root account and want to su to a specific account. Can't su to this account and show this message
How to solve:
1. use "ps -ef|grep <account name>" to check if processes of this account are too much and cause to be over the process limit value in system configuration

LV的組成如下：
HDD-->PV--->VG--->(LV0,LV1,LV2......)
簡單來說步驟如下：
1.先發現硬碟. 用fdisk -l 或check dmesg

This is because you need to connect to internet thru proxy in your network env. Try to edit /etc/yum.conf and add the following lines after [main] tag:
 
proxy=http://xxx.xxx.xx.xx:8080
proxy_username=username
proxy_password=password

To check system version:
Windows 2008 SP2--> run cmd: msinfo32
To check system type:
Windows 2003 SP2--> run cmd: systeminfo or echo %PROCESSOR_ARCHITECTURE%

set -A <array_name> `<CMD>`
for example:

 
If you deploy the ovf file to create a vm, please notice its system time.
If the system time is ealier than now, some web page can't be shown normally.
 

Step:
1. login ESXi server via SSH and check local drive partition:    
[root@esxi57:~] ls -lh /dev/disks/t10*
-rw------- 1 root root 1.8T Mar 11 10:54 /dev/disks/t10.ATA_____HGST_HUS724020ALA640__________________________PN1134P6HJ8Z4N
-rw------- 1 root root 2.0M Mar 11 10:54 /dev/disks/t10.ATA_____HGST_HUS724020ALA640__________________________PN1134P6HJ8Z4N:1
-rw------- 1 root root 1.8T Mar 11 10:54 /dev/disks/t10.ATA_____HGST_HUS724020ALA640__________________________PN1134P6HJ8Z4N:2
-rw------- 1 root root 2.7T Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA
-rw------- 1 root root 4.0M Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:1
-rw------- 1 root root 4.0G Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:2
-rw------- 1 root root 2.7T Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:3
-rw------- 1 root root 250.0M Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:5
-rw------- 1 root root 250.0M Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:6
-rw------- 1 root root 110.0M Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:7
-rw------- 1 root root 286.0M Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:8
-rw------- 1 root root 2.5G Mar 11 10:54 /dev/disks/t10.ATA_____Hitachi_HUA723030ALA640_______________________MK0331YHGD0BMA:9
-rw------- 1 root root 29.8G Mar 11 10:54 /dev/disks/t10.ATA_____SanDisk_SSD_U110_32GB___________________141280400124________
-rw------- 1 root root 2.0M Mar 11 10:54 /dev/disks/t10.ATA_____SanDisk_SSD_U110_32GB___________________141280400124________:1
-rw------- 1 root root 29.8G Mar 11 10:54 /dev/disks/t10.ATA_____SanDisk_SSD_U110_32GB___________________141280400124________:2

Before download & install, you must prepare:
1. Account of MyVMware for login, because you have to download this SW from MyVMware.
2. Check your vSphere version. Specific ovftool version is responded to the specific vSphere version. For example: ovftool v4.2.0 is sutible to vSphere 6.0, otherwise, if you run ovftools 3.5.0 on vSphere 6.0, there will be error msg like: Segmentation fault. Detail of ovftool and vSphere version mapping, you can check the release note.

when install ubuntu 16.04 LTS, there is a msg showed like this
solution: dowload iso tool: win32diskimager to make your bootable device
 
Reference: https://wiki.ubuntu.com/Win32DiskImager/iso2usb