2021-12-29 - Changed to cheap shoes felt calf pain - Fourth day
After changed to SGD15 shoes, felt calf pain on the fourth day, slow moving.
Result
Blog
2021-12-26 – Changed to cheap shoes got better performance – First time
2021-12-26 - Changed to cheap shoes got better performance - First time
After changed shoes, which is only SGD15, from Decathlon, performance is quite good compare with my old Nike, quite surprise. In fact, the distance should be also a bit longer as recorded in other days, I always jogging in same route.
Result
2021-10-20 – Lost a sole when jogging
2021-10-20 - Lost a sole when jogging
Two days ago (20 Oct 2021), I lost one sole when jogging, that was only reached 3 KM, but I decided to continue. End up, the recode not really bad as I expected.
After jogging, the shoe became like below.
Shoe Back
Sole
Jogging Record
2021-12-27 – Changed to cheap shoes got better performance – Second day
2021-12-27 - Changed to cheap shoes got better performance - Second day
After changed to SGD15 shoes felt a bit tire on the second day.
Result
Install Windows Subsystem for Linux
Table of Contents
Install Windows Subsystem for Linux
Download
- Open Microsoft Store
- Search Ubuntu
- Install
Install WSL
- Run following command in PowerShell
wsl --installCreate UNIX user and password
- Run Ubuntu
References
How to install Windows Subsystem for Linux (WSL) on Windows 10
Install WSL
Proxmox Notification Email Error
Proxmox Notification Email Error
Proxmox is using postfix as email software, and the configuration of sender email uses local hostname+domain name as below in /etc/postfix/main.cf
myhostname=full qualified hostnameIssue
The postfix tries to look for email receiver's email server, and send emails directly to the email server using myhostname defined in /etc/postfix/main.cf as senders DNS name. But the server hostname normally isn't using the public valid domain name, which causes email server rejects notification emails.
Fix
Change the default myhostname in /etc/postfix/main.cf to a valid public email domain name.
SSH Proxy
Table of Contents
SSH Proxy
When access remote servers, proxy server/jump host could be a good choice.
Two servers definition
jump_host
This is the proxy server, normally can be in the form of user@proxy_host.
target
This is the target server, has the form of target_user@target_host.
Jump host
This is the most simplest method which uses remote ssh command to login to target server. If just wants to use one SSH server to access another SSH server, run following command
ssh -t <jump_host> ssh <target>Here -t is to create a pseudo-terminal, otherwise, the remote server could not display message because no tty can be used.
Proxy Jump
This is using SSH building proxy function.
ssh -o "ProxyJump <jump_host>" <target>Proxy Command
This is to run an external command to build communication. For example, use nc command, and pass two parameters, %h is the target host, %p is the port.
ssh -o "ProxyCommand ssh <jump_host> nc %h %p" <target>Use ssh client configuration
./ssh/cofig
Instead of using command, ProxyJump and ProxyCommand can be set in ssh client configuration file.
Host <connection_name>
HostName <target_host>
User <target_user>
ProxyCommand ssh <jump_host> nc %h %pFor one server
Host target
HostName 192.168.1.2
User user1
ProxyCommand ssh user2@proxy nc %h %pFor all servers
Host * !proxy
HostName %h
User target_user
# ProxyCommand ssh proxy_user@proxy nc %h %p/etc/ssh/ssh_config
This is the same as previous example, except it is a global setting.
References
Use current TTY in Linux
Use current TTY in Linux
Find current TTY
ttyDuplicate output when using pipe
echo testing message | tee `tty` | moreNote: Some cases, tty might not reply correctly when sub shell created in command line. In this case, better save tty in variable before execute into sub shell.
Clean up /var/log/journal
Clean up /var/log/journal
Use following command can clean up /var/log/journal folder
journalctl --vacuum-size=500MList zfs Filesystems By Creation Date
List zfs Filesystems By Creation Date
There are many snapshots in Ubuntu system if using zfs as OS filesystem. In order to remove those old snapshots, need to list them by creation date using following command
zfs list -H -t snapshot -o name -S creationTo remove those old snapshots, for example, the oldest 18 snapshots can following command
zfs list -H -t snapshot -o name -S creation | tail -18 | xargs -n 1 zfs destroy