Category: Computer

Computer is miraculous!

Turn on Hibernate in Windows 10

Posted on by Bian Xi Leave a Comment on Turn on Hibernate in Windows 10

Turn on Hibernate in Windows 10

In power menu

  • Goto Control Panel\Hardware and Sound\Power Options\System Settings

  • Click on Change settings that are currently unavailable, this is to enable check box of Hibernate

  • Check Hibernate

  • Click on Save Changes

Minutes before Hibernate

  • Goto Control Panel\Hardware and Sound\Power Options\Edit Plan Settings

  • Click on Change plan settings beside current plan

  • Click on Change advanced power settings, then Power Options window appears

  • Expand Sleep->Hibernate after, change value in Settings

Remote Desktop

  • Goto Settings=>For developers=>Remote Desktop

  • Deselect Change settings so that the PC never hibernates when plugged in

Make keys behave like Windows on MacOS

Posted on by Bian Xi Leave a Comment on Make keys behave like Windows on MacOS

Make keys behave like Windows on MacOS

I tried, but failed for Control Arrow Keys. Anyway I decided drop this idea, because it is a partial solution, the Control Arrow Keys doesn't work.

Steps

Create a file ~/Library/KeyBindings/DefaultKeyBinding.dict has following contents

{
  "\UF729"  = moveToBeginningOfLine:; // home
  "\UF72B"  = moveToEndOfLine:; // end
  "$\UF729" = moveToBeginningOfLineAndModifySelection:; // shift+home
  "$\UF72B" = moveToEndOfLineAndModifySelection:; // shift+end
  "^\UF729" = moveToBeginningOfDocument:; // ctrl+home
  "^\UF72B" = moveToEndOfDocument:; // ctrl+end
  "^$\UF729" = moveToBeginningOfDocumentAndModifySelection:; // ctrl+shift+home
  "^$\UF72B" = moveToEndOfDocumentAndModifySelection:; // ctrl+shift+end
  "^\UF702" = "moveWordBackward:"; // ctrl+leftarrow
  "^\UF703" = "moveWordForward:"; // ctrl+rightarrow
  "^$\UF702" = "moveWordBackwardAndModifySelection:"; // shift+ctrl+leftarrow
  "^$\UF703" = "moveWordForwardAndModifySelection:"; // shift+ctrl+rightarrow
}

Alternatively, change Line to Paragraph, depending on your prefers.

References

Make Home & End keys behave like Windows on Mac OS X

Mount SMB3 in Linux

Posted on by Bian Xi Leave a Comment on Mount SMB3 in Linux

Mount SMB3 in Linux

Install package

sudo apt install cifs-utils

Mount from command line

sudo mount -t cifs //192.168.1.100/Movies /mnt/Media vers=3.0,credentials=/etc/smbcredentials,uid=111,gid=1000,pass=PASSWORD

Add into /etc/fstab

  • Create credentials file /etc/smbcredentials
username=user
password=password
domain=domain
  • Update mode
chown root:root /etc/smbcredentials
chmod 600 /etc/smbcredentials
  • Update /etc/fstab
//server/share_name  /mnt/smbshare  cifs  credentials=/etc/smbcredentials,vers=3.0,file_mode=0755,dir_mode=0755 0       0

References

How to Mount Windows Share on Linux using CIFS

Disable Apple mouse swipe action

Posted on by Bian Xi Leave a Comment on Disable Apple mouse swipe action

Disable Apple mouse swipe action

It is very easy for Apple mouse understands wrongly, and take action to back to my previous page. As the result, my few hours working on WordPress disappered.

Change mouse

Then I start using normal mouse, but hard to change between screen using keyboard, my remote control and virtual machine doesn't understand the keys, and holding keyboard actions made wrong password in login screen.

Disable swipe action

Then I found the way to disable swipe action as below

system preferences>trackpad or mouse>more gestures tab>uncheck "swipe between pages".

References

I just accidentally swiped right on my web page...how do I get it back?

Ping fails but nslookup works in MacOS

Posted on by Bian Xi Leave a Comment on Ping fails but nslookup works in MacOS

Ping fails but nslookup works

When performing nslookup, the IP can be returned. But when performing ping, return following error

ping: cannot resolve <hostname>: Unknown host

Causes

Second DNS server issue

The second DNS server isn't resolving the IP address.

Another DHCP server issue

Another DHCP server provide different DNS server.

Fix

killall -HUP mDNSResponder

References

DNS lookup fails but nslookup works

Install OpenVPN client in ubuntu

Posted on by Bian Xi Leave a Comment on Install OpenVPN client in ubuntu

Install OpenVPN client in ubuntu

Due to PPTP might not available, OpenVPN can be a good choice.

Packages

apt install openvpn

Configuration file

Configuration file should be downloaded from OpenVPN server.

Test

openvpn --config client.ovpn

Enable option

In /etc/default/openvpn, enable following line

AUTOSTART="all"

Copy config file

cp client.ovpn /etc/openvpn/client.conf

Note: the file name should be client.conf

Enable password (Optional)

Change auth-user-pass to auth-user-pass pass in client.conf.

Then create account info in pass file, and change mode

chmod 400 /etc/openvpn/pass

Enable service

systemctl enable openvpn@client.service
systemctl daemon-reload
systemctl start openvpn@client

References

Linux - Autostart OpenVPN in systemd (Ubuntu)

Configure PPTP in Ubuntu

Posted on by Bian Xi Leave a Comment on Configure PPTP in Ubuntu

Configure PPTP in Ubuntu

Install packages

apt-get install pptp-linux

Configure password

vi /etc/ppp/chap-secrets

The format should be

pptpuser    PPTP    pptppassword    *

Create route script

Create file /etc/ppp/ip-up.d/route-traffic

#!/bin/bash

route add -net 192.168.1.0/8 dev ppp0

Change mode to executable

chmod +x /etc/ppp/ip-up.d/route-traffic

Create dial up configure

The name of file is defined as connection name, such as /etc/ppp/peers/<CONNECTON>

pty "pptp <HOST> --nolaunchpppd"
name <USER>
remotename PPTP
require-mppe-128
file /etc/ppp/options.pptp
ipparam <CONNECTON>

Open filewall

iptables -A INPUT -i pptp -j ACCEPT
iptables -A OUTPUT -o pptp -j ACCEPT

Connect and disconnect

pon <CONNECTON>
poff <CONNECTION>

Troubleshooting

If didn't configure PPTP Passthrough on your NAT, then PPTP will failed.

PPTP uses a TCP channel on port 1723 for control and the GRE protocol to encapsulate data and create a VPN tunnel. The issue isn’t really PTPP itself but GRE; GRE doesn’t use ports. Since a requirement of NAT is that the connection must use an IP address and port number it doesn’t work with GRE. This is what PTPP passthrough addresses.

References

Set up Linux PPTP Client from the Terminal
Connect to PPTP server via command line on Ubuntu
pptp - 'Administrative Shutdown'. Error code is 0, Cause code is 0

Troubleshooting Hashicorp Vault SSH Certificate Login

Posted on by Bian Xi Leave a Comment on Troubleshooting Hashicorp Vault SSH Certificate Login

Troubleshooting Hashicorp Vault SSH Certificate Login

If can not login via SSH, normally can use -vvv as SSH option in SSH client command to verify, but it could be very long to read.

Another way is use systemctl status sshd command at server side to check the error.

For example, the output of systemctl status sshd got following lines,

Dec 12 00:40:37 example-host systemd[1]: Started OpenBSD Secure Shell server.
Dec 12 00:40:54 example-host sshd[22712]: error: Certificate invalid: expired
Dec 12 00:40:54 example-host sshd[22712]: Connection closed by authenticating user ubuntu 101.78.78.154 port 53369 [preauth]
Dec 12 00:41:12 example-host sshd[22716]: error: Certificate invalid: name is not a listed principal
Dec 12 00:41:12 example-host sshd[22716]: Connection closed by authenticating user ubuntu 101.78.78.154 port 53372 [preauth]

The first error shows vault signed certificate at client side had expired, need to rerun vault command to regenerate signed certificate.

The second error shows the user name was used in client is not listed in vault signed certificate, so need to use correct user name or configure a new role in the vault.

Run do-release-upgrade to ubuntu 21.10

Posted on by Bian Xi Leave a Comment on Run do-release-upgrade to ubuntu 21.10

Run do-release-upgrade to ubuntu 21.10

Looks like a simple task, but ending with many things to do...

No screen

After run do-release-upgrade, I went to sleep, then ssh connection dropped due to iMac auto sleep. The installation stopped at asking question of grub installation.

When I check the process, got a process similar to below one, which is still at pts/1, which means the process is still running at another virtual terminal.

/usr/bin/python3 /tmp/ubuntu-release-upgrader-qzt422az/focal --mode=server --frontend=DistUpgradeViewText

When I try to run do-release-upgrade again, got following message.

# do-release-upgrade 
Checking for a new Ubuntu release
No new release found.

Then I try to run apt install screen, says apt is locked by process nnnn.

As suggested by others, I killed the process nnnn, and run following command, then the terminal change to installation virtual screen, and continued.

dpkg --configure -a

Error on grub-efi

Then got following error

# dpkg --configure -a
Setting up grub-efi-amd64-signed (1.173+2.04-1ubuntu47) ...
NTFS signature is missing.
Failed to mount '/dev/sda1': Invalid argument
The device '/dev/sda1' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?
dpkg: error processing package grub-efi-amd64-signed (--configure):
 installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 12
Errors were encountered while processing:
 grub-efi-amd64-signed

As suggested by others, I ran following commands, which remove grub2 and install grub, then no error any more.

Note: do backup of /etc/default/grub, and verify the contents. I didn't do this, caused more issues later

apt-get purge grub\*
sudo apt-get install grub-efi
sudo apt-get autoremove
sudo update-grub

No zpool found during reboot

The system go into initramfs mode after reboot, looks like iSCSI devices not found.

Then I booted from CD again, and found that iSCSI configuration in /etc/default/grub was missing.

After login to iSCSI, I mirror back the bpool and rpool back to local disk, and run following command to fix it.

update-initramfs -v -k $(uname -r) -c
update-grub

Forgot waiting for resilvering finish

Forgot wait for zpool sync finish, the I rebooted the server.

Note: Some people said it is ok, but my case is NOT OK.

After perform zpool resync again, got following error with local partition CKSUM = 1.

One or more devices has experienced an unrecoverable error.

This was caused by reboot, just perform following command to clean the flag.

zpool clear rpool

Booting hung

This is an old issue, caused by network shutdown before iSCSI drive dismount. Run following command,

systemctl edit --full open-iscsi.service

Comment out the following line

#ExecStop=/lib/open-iscsi/logout-all.sh

References

Sub-process /usr/bin/dpkg returned an error code (1)