【RocksDB】basic

RocksDB

The RocksDB library provides a persistent key value store. Keys and values are arbitrary byte arrays. The keys are ordered within the key value store according to a user-specified comparator function.

...

Posted by Wei on 2021-10-12, Last Modified on 2024-09-25

【Kafka】Troubleshooting

could not be established. Broker may not be available

Error

$ kafka-topics --bootstrap-server 192.168.18.134:9092 --topic demo_topic --describe
[2021-10-10 22:39:38,319] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (/192.168.18.134:29092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)

...

Posted by Wei on 2021-10-10, Last Modified on 2025-04-23

【Kafka】Advance

...

Posted by Wei on 2021-10-09, Last Modified on 2023-02-17

【TrueNAS】VM 磁盘空间不足

在进入Ubuntu调整之前，需要先在Pool中将该ZVol的可占用空间调大，我这里已经调到了200GB

...

Posted by Wei on 2021-10-09, Last Modified on 2024-08-28

【Linux】清除磁盘空间

Problem

But for some reason I kept getting 28: No space left on device when I run apt-get update. I tried to solve this by trying apt-get clean, which seemed to work for a little bit but then still had the same issue.

No space left on device” is a prompt that is generated when your disk space is completely filled. There is a chance of encountering this issue, even when the disk space isn’t really full. This might happen when your server’s disk space runs out of Inodes.

查看占用

查看当前物理disk占用情况

$ lsblk
NAME                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0                       7:0    0 55.4M  1 loop /snap/core18/1944
loop1                       7:1    0 55.4M  1 loop /snap/core18/2128
loop2                       7:2    0 61.8M  1 loop /snap/core20/1081
loop3                       7:3    0 67.3M  1 loop /snap/lxd/21545
loop4                       7:4    0 70.3M  1 loop /snap/lxd/21029
loop5                       7:5    0 61.9M  1 loop /snap/core20/1169
loop6                       7:6    0 32.4M  1 loop /snap/snapd/13270
loop7                       7:7    0 32.3M  1 loop /snap/snapd/13170
sda                         8:0    0  200G  0 disk
|-sda1                      8:1    0  512M  0 part /boot/efi
|-sda2                      8:2    0    1G  0 part /boot
`-sda3                      8:3    0 48.5G  0 part
  `-ubuntu--vg-ubuntu--lv 253:0    0 34.3G  0 lvm  /

查看当前文件系统占用情况

$ df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               1.9G     0  1.9G   0% /dev
tmpfs                              394M  996K  393M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   34G   24G  8.2G  75% /
tmpfs                              2.0G     0  2.0G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                              2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sda2                          976M  300M  609M  34% /boot
/dev/loop0                          56M   56M     0 100% /snap/core18/1944
/dev/sda1                          511M  5.3M  506M   2% /boot/efi
/dev/loop1                          56M   56M     0 100% /snap/core18/2128
/dev/loop3                          68M   68M     0 100% /snap/lxd/21545
/dev/loop2                          62M   62M     0 100% /snap/core20/1081
/dev/loop4                          71M   71M     0 100% /snap/lxd/21029
/dev/loop5                          62M   62M     0 100% /snap/core20/1169
/dev/loop6                          33M   33M     0 100% /snap/snapd/13270
/dev/loop7                          33M   33M     0 100% /snap/snapd/13170
tmpfs                              394M  176K  394M   1% /run/user/1000

查看LVM卷组的信息

$ sudo vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <48.50 GiB
  PE Size               4.00 MiB
  Total PE              12415
  Alloc PE / Size       8768 / 34.25 GiB
  Free  PE / Size       3647 / <14.25 GiB
  VG UUID               OWAYr3-DITL-hFT3-eyHu-Yf2t-nKsP-62GTHG

清理APT缓存

View Cache Space

$ sudo du -sh /var/cache/apt

一旦决定清理apt缓存，清理命令如下：

$ sudo apt-get clean

apt clean 命令将删除保留在apt缓存中的所有软件包。当然如果你本地网络并不快速，你也可以不用清理，避免安装软件时下载大量软件包耗费时间。

...

Posted by Wei on 2021-10-09, Last Modified on 2025-04-23

西维蜀黍