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
After changed to SGD15 shoes felt a bit tire on the second day.
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wsl --installHow to install Windows Subsystem for Linux (WSL) on Windows 10
Install WSL
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 hostnameThe 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.
Change the default myhostname in /etc/postfix/main.cf to a valid public email domain name.
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When access remote servers, proxy server/jump host could be a good choice.
This is the proxy server, normally can be in the form of user@proxy_host.
This is the target server, has the form of target_user@target_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.
This is using SSH building proxy function.
ssh -o "ProxyJump <jump_host>" <target>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>./ssh/cofigInstead 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 %pHost target
HostName 192.168.1.2
User user1
ProxyCommand ssh user2@proxy nc %h %pHost * !proxy
HostName %h
User target_user
# ProxyCommand ssh proxy_user@proxy nc %h %p/etc/ssh/ssh_configThis is the same as previous example, except it is a global setting.
ttyecho 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.
Use following command can clean up /var/log/journal folder
journalctl --vacuum-size=500MThere 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 destroyNote: These steps are not effective, the problem is still there.
services.mscThe k3s supposed to be the lightweight k8s, but it used more than 10% when no container running. The problem was reported when TrueNAS running as VM.
This issue also caused high disk utilization, which caused whole system slow, huge IO wait.
There is a zpool called ix-applications created for k3s. To stop k3s process, needs to unset pool in Apps => Settings => Unset Pool.
After Unset Pool, the CPU utilization dropped from 70% to 5%.