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
Solution:
- Oct 05 Fri 2018 15:50
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ORA-12154 in Oracle reco trace file
- Aug 30 Thu 2018 15:01
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su failed to execute /bin/bash resource temporarily unavailable
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
2. the ps result showed that there were 588 processes under this account.
3. because these processes coneected to database, it was neccesary to kill them not only in OS but also in DB
- Aug 31 Thu 2017 10:55
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how to extend lvm size?
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
2. 將這個硬碟做partition.
- Jun 01 Thu 2017 17:07
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yum update failed with PYCURL ERROR 7 - "Failed to connect to 2a02:2498:1:3d:5054:ff:fed3:e91a: Network is unreachable
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:8080proxy_username=username
proxy_password=password- May 17 Wed 2017 11:06
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How to check windows system version & type & patch by CMD
To check system version:
Windows 2008 SP2--> run cmd: msinfo32
To check system type:
Windows 2003 SP2--> run cmd: systeminfo or echo %PROCESSOR_ARCHITECTURE%
CMD:systeminfo will also list other system information
- May 17 Wed 2017 11:00
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declare an array in shell script on HP-UX platform
set -A <array_name> `<CMD>`
for example:
set -A amdsp_line `cat fc60_enc.tmp| awk '{if ($0 ~ /ystem/) print NR}END{print FNR}'`
- Apr 10 Mon 2017 20:10
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Notice the time when you deploy ovf VM
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.
For example, today is 2017/04/10 20:18, but the vm time is 2017/03/10 04:11
- Apr 10 Mon 2017 19:02
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delete partition on esxi server but shows msg:"Unable to delete partition 1 from device"
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
- Apr 07 Fri 2017 19:01
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esxi command to deploy/export ovf:ovftools
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.
The install step and the export usage:
1. When you are ready to install, Please download 64-bit for linux and run the shell script as ./VMware-ovftool-4.2.0-*-lin.x86_64.bundle. You have to agree the license declaime and press Enter, then the install complete.
- Feb 14 Tue 2017 19:37
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failed to load ldlinux.c32
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
- Jan 20 Fri 2017 01:19
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Setup a slave dns server on CentOS7
- Jan 20 Fri 2017 01:09
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SELinux on CentOS7 & Ubuntu 16.04
--CentOS7
1. check SELinux status: getenforce
2. disable SELinux temporarily:setenforce 0
3. disable SELinux permanent: vi /etc/sysconfig/selinux and replace "SELINUX=enforcing" to "SELINUX=disabled" then reboot.
--Ubuntu 16.04