主页 / user-318799

bitinerant's questions

Martin Hope
bitinerant
Asked: 2019-05-15 02:36:56 +0800 CST
  • 2

CodiMD非常适合协作工作，但我想在我的笔记本电脑 (Ubuntu 18.04) 上使用它来做个人笔记，配置它可以在没有互联网连接的情况下工作并使用尽可能少的资源。手动安装似乎是一个很好的起点，但说明假设我不熟悉 Node、npm、数据库管理员等知识。我不需要 TLS、用户身份验证或与云服务的连接。

这是我到目前为止所拥有的：

sudo apt install -y nodejs npm sqlite3
sudo npm install -g node-gyp
sudo npm install -g yarn
# broken: sudo apt install -y libssl-dev
git clone https://github.com/codimd/server.git
cd server
sudo bin/setup
sudo vi config.json .sequelizerc
# in vi, copy 4 "db" lines from "development" to "production"
# in vi, disable "hsts" and "csp"
# in vi, what should go in the "url" line?
# in vi, what else needs modificaiton?
sudo npm run build
sudo npm start --production  # fails:  sequelize db:migrate && node app.js
# what is the best way to start CodiMD at boot?

简而言之，我正在寻找在 Ubuntu 上设置最少 1 个用户的 CodiMD 的详细说明。

ubuntu node.js
Martin Hope
bitinerant
Asked: 2018-12-27 06:53:05 +0800 CST
  • 7

对于/tmpin /etc/fstab，我有mode=1777，但重新启动后，权限/tmp为0755。另一个目录/var/tmp的配置方式完全相同，但没有这个问题（见下文）。这是一个运行 Ubuntu 18.04 服务器的树莓派。根文件系统是一个只读安装的 microSD 卡。

使1777权限永久化的正确方法是什么？

以下是一些额外的细节（重新启动后）：

$ touch /tmp/test
touch: cannot touch '/tmp/test': Permission denied

$ whoami
ubuntu

$ ls -ld /tmp /var/tmp
drwxr-xr-x 9 root root 180 Dec 26 13:54 /tmp
drwxrwxrwt 4 root root  80 Dec 26 13:54 /var/tmp

$ mount |grep /tmp
tmpfs on /var/tmp type tmpfs (rw,nosuid,nodev,noexec,noatime,size=65536k)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noexec,noatime,size=131072k)

$ grep /tmp /etc/fstab
tmpfs  /var/tmp  tmpfs  defaults,noatime,nosuid,nodev,noexec,mode=1777,size=64M   0  0
tmpfs  /tmp      tmpfs  defaults,noatime,nosuid,nodev,noexec,mode=1777,size=128M  0  0

$ sudo systemctl status tmp.mount
● tmp.mount - /tmp
   Loaded: loaded (/etc/fstab; generated)
   Active: active (mounted) since Sun 2018-01-28 15:58:18 UTC; 10 months 27 days ago
    Where: /tmp
     What: tmpfs
     Docs: man:fstab(5)
           man:systemd-fstab-generator(8)
  Process: 642 ExecMount=/bin/mount tmpfs /tmp -t tmpfs -o defaults,noatime,nosuid,nodev,noexec,mode=1777,size=128M (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 2146)
   CGroup: /system.slice/tmp.mount

Jan 28 15:58:18 testsystem systemd[1]: Mounting /tmp...
Jan 28 15:58:18 testsystem systemd[1]: Mounted /tmp.

$ grep -R '/tmp' /etc/tmpfiles.d /usr/lib/tmpfiles.d
/usr/lib/tmpfiles.d/x11.conf:D! /tmp/.X11-unix 1777 root root 10d
/usr/lib/tmpfiles.d/x11.conf:D! /tmp/.ICE-unix 1777 root root 10d
/usr/lib/tmpfiles.d/x11.conf:D! /tmp/.XIM-unix 1777 root root 10d
/usr/lib/tmpfiles.d/x11.conf:D! /tmp/.font-unix 1777 root root 10d
/usr/lib/tmpfiles.d/x11.conf:D! /tmp/.Test-unix 1777 root root 10d
/usr/lib/tmpfiles.d/x11.conf:r! /tmp/.X[0-9]*-lock
/usr/lib/tmpfiles.d/tmp.conf:D /tmp 1777 root root -
/usr/lib/tmpfiles.d/tmp.conf:#q /var/tmp 1777 root root 30d
/usr/lib/tmpfiles.d/tmp.conf:x /tmp/systemd-private-%b-*
/usr/lib/tmpfiles.d/tmp.conf:X /tmp/systemd-private-%b-*/tmp
/usr/lib/tmpfiles.d/tmp.conf:x /var/tmp/systemd-private-%b-*
/usr/lib/tmpfiles.d/tmp.conf:X /var/tmp/systemd-private-%b-*/tmp
/usr/lib/tmpfiles.d/tmp.conf:R! /tmp/systemd-private-*
/usr/lib/tmpfiles.d/tmp.conf:R! /var/tmp/systemd-private-*

$ sudo chmod 1777 /tmp

$ ls -ld /tmp /var/tmp
drwxrwxrwt 9 root root 180 Dec 26 13:55 /tmp
drwxrwxrwt 4 root root  80 Dec 26 13:55 /var/tmp

$ cat /etc/rc.local
#!/bin/bash
service ntp start
exit 0

$ uname -a
Linux testsystem 4.15.0-1030-raspi2 #32-Ubuntu SMP PREEMPT Fri Dec 7 09:15:28 UTC 2018 armv7l armv7l armv7l GNU/Linux

相关的未回答问题：

mount fstab
Martin Hope
bitinerant
Asked: 2018-11-14 13:52:45 +0800 CST
  • 0

在我们的家庭局域网上，重新启动路由器后，我无法从笔记本电脑 A ssh 到笔记本电脑 B，除非通过路由器。但是，在从笔记本电脑 B ping 笔记本电脑 A 后，我可以正常地从 A 连接到 B。我可以通过重新启动路由器来重现此问题。两台笔记本电脑都通过 WiFi 连接到路由器，并且没有连接其他 AP 或路由器。LAN 上还有其他设备，我不知道任何其他 ARP 问题。

路由器重启后演示问题：

scott@laptopa:~$ ip addr show dev wlp58s0 |grep 'inet '
    inet 192.168.8.194/24 brd 192.168.8.255 scope global dynamic noprefixroute wlp58s0
scott@laptopa:~$ ssh 192.168.8.131 echo okay
ssh: connect to host 192.168.8.131 port 443: No route to host
scott@laptopa:~$ ssh 192.168.8.131 echo okay
ssh: connect to host 192.168.8.131 port 443: No route to host
scott@laptopa:~$ ssh 192.168.8.131 echo okay
ssh: connect to host 192.168.8.131 port 443: No route to host
scott@laptopa:~$ arp |grep 9c:b6:d0:44:18:09
scott@laptopa:~$

尴尬的解决方法：

scott@laptopa:~$ ssh -o 'ProxyCommand ssh -q -W %h:%p [email protected]' 192.168.8.131 'ping -c 10 192.168.8.194'
PING 192.168.8.194 (192.168.8.194) 56(84) bytes of data.
64 bytes from 192.168.8.194: icmp_seq=1 ttl=64 time=66.3 ms
64 bytes from 192.168.8.194: icmp_seq=2 ttl=64 time=22.9 ms
64 bytes from 192.168.8.194: icmp_seq=3 ttl=64 time=106 ms
64 bytes from 192.168.8.194: icmp_seq=4 ttl=64 time=230 ms
64 bytes from 192.168.8.194: icmp_seq=5 ttl=64 time=252 ms
64 bytes from 192.168.8.194: icmp_seq=6 ttl=64 time=275 ms
64 bytes from 192.168.8.194: icmp_seq=7 ttl=64 time=298 ms
64 bytes from 192.168.8.194: icmp_seq=8 ttl=64 time=321 ms
64 bytes from 192.168.8.194: icmp_seq=9 ttl=64 time=38.3 ms
64 bytes from 192.168.8.194: icmp_seq=10 ttl=64 time=60.3 ms

--- 192.168.8.194 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9012ms
rtt min/avg/max/mdev = 22.950/167.478/321.937/112.761 ms

证明它现在可以正常工作：

scott@laptopa:~$ ssh 192.168.8.131 echo okay
okay
scott@laptopa:~$ arp |grep 9c:b6:d0:44:18:09
laptopb.lan              ether   9c:b6:d0:44:18:09   C                     wlp58s0

笔记本电脑 A 和 B 都运行 Ubuntu 18.04，路由器是 Lede (OpenWRT) 17.01.4。

networking ubuntu