It happened after clicked refresh browser button when updating plugin.
Remove .maintenance file
How to Fix ‘Briefly Unavailable for Scheduled Maintenance. Check Back in a Minute’
fsck on reboot for Ubuntu 20.04The Maximum mount setting for ext4 file system can be used to enforce fsck to be executed on root file system.
sudo tune2fs -l /dev/nvme0n1p2 | grep 'Maximum mount'Note: Chances are this is set to -1 nowadays, disabling check based on the number of times the volume has been mounted.
sudo tune2fs -c 1 /dev/nvme0n1p2Table of Contents
/var/log/journal and /var/cache/abrt-di in Ubuntu/var/log/journaljournalctl --disk-usageEdit /etc/systemd/journald.conf
SystemMaxUse=50Msystemctl restart systemd-journald.service/var/cache/abrt-di$ grep -i size /etc/abrt/abrt.conf
# Max size for crash storage [MiB] or 0 for unlimited
MaxCrashReportsSize = 1000/var/cache/abrt-di$ grep -i DebugInfoCacheMB /etc/abrt/plugins/CCpp.conf
DebugInfoCacheMB = 2000Can I remove files in /var/log/journal and /var/cache/abrt-di/usr?
Press Ctrl+Alt+F3 to tty3 text console, and switch back via Ctrl+Alt+F2.
Edit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"GRUB_CMDLINE_LINUX="text"GRUB_TERMINAL="console" to disable graphical terminal.Update grub by running command update-grub
Set system to multi user mode systemctl set-default multi-user.target
To enable Windows 10 Pro support long file name, Group Policy needs to be modified.
gpedit.mscComputer Configuration => Administrative Templates => System => Filesystem.Enable Win32 long paths.Table of Contents
After I found there is an internal memory also can be replaced, I decided to try replace it with higher capacity memory.
I got one 4GB memory and one 1GB default memory.
Because the default is not easy to reach and I'm not sure whether the slot is suitable for 4GB RAMs or not, so I swap two RAMs and boot.
Result: It works. Not the default memory slot has 4GB RAM in it.
Then I replace the 1GB memory to 2GB as below.
root@ds1812:~# free
total used free shared buff/cache available
Mem: 6106616 576752 593516 16440 4936348 5115404
Swap: 2097084 166520 1930564
root@ds1812:~# cat /proc/meminfo
MemTotal: 6106616 kB
MemFree: 434420 kB
Buffers: 5968 kB
Cached: 4793912 kB
SwapCached: 18104 kB
Active: 1456104 kB
Inactive: 3398440 kB
Active(anon): 30672 kB
Inactive(anon): 40608 kB
Active(file): 1425432 kB
Inactive(file): 3357832 kB
Unevictable: 5560 kB
Mlocked: 5560 kB
SwapTotal: 2097084 kB
SwapFree: 1930572 kB
Dirty: 48688 kB
Writeback: 0 kB
AnonPages: 48644 kB
Mapped: 42632 kB
Shmem: 16448 kB
Slab: 289948 kB
SReclaimable: 113820 kB
SUnreclaim: 176128 kB
KernelStack: 9360 kB
PageTables: 44156 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 5150392 kB
Committed_AS: 1645472 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 465564 kB
VmallocChunk: 34359255664 kB
DirectMap4k: 16876 kB
DirectMap2M: 6262784 kB
root@ds1812:~#Table of Contents
To create custom CA and use it to create server certificate, Synology NAS can be used and manage them.
Control Panel => SecurityCertificate tabAdd button and select Add menu itemAdd a new certificate or Replace an existing certificate, then NextCreate self-signed certificate, then NextCreate root certificate for CA certificate, then NextCreate certificate for server certificate, then ApplyFollowing 4 certificates are created and can be exported
cert.pem - Server certificateprivkey.pem - Server Keysyno-ca-cert.pem - CA certificatesyno-ca-privkey.pem - CA KeyControl Panel => SecurityCertificate tabCSR buttonCreate Certificate Singing Request, then NextCreate certificate signed request (CSR), then NextDownloadFollowing files are created in downloaded ZIP file
server.csrserver.keyControl Panel => SecurityCertificate tabCSR buttonSign Certificate Singing Request, then NextNextserver.csr file using Browse button next to the Certificate Request textboxSubject Alternative Name, then NextDownloadFollowing files are created in downloaded ZIP file
server.crtControl Panel => SecurityCertificate tabAdd button and select Add menu itemAdd a new certificate or Replace an existing certificate, then NextDescription, select Import certificate, then NextOKWhen creating snapshot failed, the snapshot can not be deleted via GUI.
qm unlock <vm_id>Use snapshot name to create for each vm disk
zfs snapshot -r <disk_zvol>@<snapshot_name>Table of Contents
Download and run CPUID HWMonitor.
Download and install HWiNFO
Run following command
cat /sys/class/thermal/thermal_zone*/tempDownload and run XRG
Go to Control Panel -> Info Center -> General
CPU cores
/sys/devices/platform/coretemp.0/temp3_input
/sys/devices/platform/coretemp.0/temp2_inputfollowing files might be useful
/sys/devices/platform/coretemp.0/temp3_label
/sys/devices/platform/coretemp.0/temp2_crit_alarm
/sys/devices/platform/coretemp.0/temp2_crit
/sys/devices/platform/coretemp.0/temp3_crit
/sys/devices/platform/coretemp.0/temp3_crit_alarm
/sys/devices/platform/coretemp.0/temp2_labelcat /sys/class/hwmon/hwmon0/device/temp1_inputGo to Control Panel -> Info Center -> Storage
Run following commands
smartctl -d sat -T permissive -l scttempsts /dev/sdX | grep Currentsynodisk --read_temp /dev/sdaCPUID HWMonitor
Professional System Information and Diagnostics
How to Check CPU Temperature on Linux
XRG
Table of Contents
zpool import <existing_pool_name> <new_pool_name>Create storage via GUI
You have to connect to the node where you create the zpool to create storage in Proxmox Datacenter.
ZFS Pool Import - Proxmox single host reinstall without full backup
zpool not shown when add storage