OSError: [Errno 30]

Question

OSError: [Errno 30]

titithebad opened this issue 5 years ago · 8 comments

Hello,

I have got this error :
2020/04/14-08:15:15 [18005] OSError: [Errno 30] Read-only file system: '/etc/munin/plugins/Freebox-OS-munin/freebox.json'
2020/04/14-08:15:15 [18005] Service 'freebox-ftth' exited with status 1/0.
2020/04/14-08:15:18 [18005] Error output from freebox-temp:

How can I correct that ?

Regards

Answer 1 · 2020-04-14T06:33:12.000Z

Hello !

It seems that you're experiencing a disk issue (Read-only file system):

do you have enough free disk left?
can you write on the partition that holds /etc? (try touch /etc/munin/plugins/Freebox-OS-munin/test.txt)

Answer 2 · 2020-04-14T06:36:22.000Z

Hello, By default, systemd now prevents services from writing files to some locations. However, the Freebox plugin needs write permissions to /usr where is located the JSON file. I disabled this protection in /etc/systemd/system/multi-user.target.wants/munin-node.service by modifying the following : #ProtectSystem=full ProtectSystem=false There might be some better ways to deal with this issue, than disabling some important security, though : - Move JSON file to a writable location by default - Adding a custom config file instead of editing the default systemd file - Trying ProtectSystem=strict Regards, Julien

Answer 3 · 2020-04-14T08:54:57.000Z

I am user pi on my Rpi.

If I put it in /home/pi, it should be fine ?

What should I write in the plugin/munin-node file ? Which user ? Which group ?

I have an other error :
Error output from freebox-traffic:
2020/04/14-11:05:03 [1823] Can't exec "/etc/munin/plugins/freebox-traffic": No such file or directory at /usr/share/perl5/Munin/Node/Service.pm line 269, line 7.

As I execute each link manually, everything works perfectly...

Answer 4 · 2020-04-14T11:00:13.000Z

I am user pi on my Rpi.

If I put it in /home/pi, it should be fine ?

No, because systemd also prevent access to /home.
You will find more information here : https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Sandboxing

Answer 5 · 2020-04-14T12:44:51.000Z

Thanks but I do not see in which file I have to modify ?

Answer 6 · 2020-04-14T12:57:26.000Z

As explained in #40 (comment) I modified /etc/systemd/system/multi-user.target.wants/munin-node.service.
However it might be a better idea to create an override in /etc/systemd/system/munin-node.service.d/.

Answer 7 · 2020-04-15T09:37:34.000Z

Okay, it works now !

Thanks !!

Answer 8 · 2020-04-17T13:56:07.000Z

hi

I changed directory to /var/lib/munin-node/plugin-state/nobody/Freebox-OS-munin/freebox.json
here munin can write without remove systemd protection.