NFS Mounting from apache2 php worked as expected under Ubuntu 16 but not Ubuntu 18.04





.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}







1















I have php code for apache2 that is supposed to mount NFS filesystems on the server. They have the form of exec("some scripts that do the mount that has the correct sudo permissions");



This worked fine and as expected on ubuntu 16. After mounting I could do a 'df' and the mounted volume would appear and I could access it as expected.



Under ubuntu 18, the behavior is different and I don't understand it. It seems to do a virtual or temporary mount but nobody but www-data user can access it. In other words, I do php



exec("mount script");
exec("df > some_log_file");



and some_log_file will show the mount. But if at the same time I log into the server, either directly on the display or via ssh, and I type 'df' it does NOT appear (nor is it accessible in any other way even as root).



I'm guessing this might have something to do with systemd since it's sort of like the PrivateTmp thing, but I can't even figure out what string to type into google to figure out what's going on.



Note: this is an apache server that is on an isolated LAN NOT connected to the Internet so there is no security risk so you needn't point the riskiness out.






18.04 mount apache2 php nfs







share|improve this question























  • How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

    – Pasi Suominen
    Apr 6 at 22:16











  • Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

    – pa4080
    Apr 8 at 9:15











  • The mount point wasn't in /tmp but I'll try mounting other places.

    – Bret Wallach
    Apr 8 at 22:29


















1















I have php code for apache2 that is supposed to mount NFS filesystems on the server. They have the form of exec("some scripts that do the mount that has the correct sudo permissions");



This worked fine and as expected on ubuntu 16. After mounting I could do a 'df' and the mounted volume would appear and I could access it as expected.



Under ubuntu 18, the behavior is different and I don't understand it. It seems to do a virtual or temporary mount but nobody but www-data user can access it. In other words, I do php



exec("mount script");
exec("df > some_log_file");



and some_log_file will show the mount. But if at the same time I log into the server, either directly on the display or via ssh, and I type 'df' it does NOT appear (nor is it accessible in any other way even as root).



I'm guessing this might have something to do with systemd since it's sort of like the PrivateTmp thing, but I can't even figure out what string to type into google to figure out what's going on.



Note: this is an apache server that is on an isolated LAN NOT connected to the Internet so there is no security risk so you needn't point the riskiness out.






18.04 mount apache2 php nfs







share|improve this question























  • How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

    – Pasi Suominen
    Apr 6 at 22:16











  • Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

    – pa4080
    Apr 8 at 9:15











  • The mount point wasn't in /tmp but I'll try mounting other places.

    – Bret Wallach
    Apr 8 at 22:29














1












1








1








I have php code for apache2 that is supposed to mount NFS filesystems on the server. They have the form of exec("some scripts that do the mount that has the correct sudo permissions");



This worked fine and as expected on ubuntu 16. After mounting I could do a 'df' and the mounted volume would appear and I could access it as expected.



Under ubuntu 18, the behavior is different and I don't understand it. It seems to do a virtual or temporary mount but nobody but www-data user can access it. In other words, I do php



exec("mount script");
exec("df > some_log_file");



and some_log_file will show the mount. But if at the same time I log into the server, either directly on the display or via ssh, and I type 'df' it does NOT appear (nor is it accessible in any other way even as root).



I'm guessing this might have something to do with systemd since it's sort of like the PrivateTmp thing, but I can't even figure out what string to type into google to figure out what's going on.



Note: this is an apache server that is on an isolated LAN NOT connected to the Internet so there is no security risk so you needn't point the riskiness out.






18.04 mount apache2 php nfs







share|improve this question














I have php code for apache2 that is supposed to mount NFS filesystems on the server. They have the form of exec("some scripts that do the mount that has the correct sudo permissions");



This worked fine and as expected on ubuntu 16. After mounting I could do a 'df' and the mounted volume would appear and I could access it as expected.



Under ubuntu 18, the behavior is different and I don't understand it. It seems to do a virtual or temporary mount but nobody but www-data user can access it. In other words, I do php



exec("mount script");
exec("df > some_log_file");



and some_log_file will show the mount. But if at the same time I log into the server, either directly on the display or via ssh, and I type 'df' it does NOT appear (nor is it accessible in any other way even as root).



I'm guessing this might have something to do with systemd since it's sort of like the PrivateTmp thing, but I can't even figure out what string to type into google to figure out what's going on.



Note: this is an apache server that is on an isolated LAN NOT connected to the Internet so there is no security risk so you needn't point the riskiness out.






18.04 mount apache2 php nfs




18.04 mount apache2 php nfs






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Apr 6 at 21:47









Bret WallachBret Wallach

163




163













  • How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

    – Pasi Suominen
    Apr 6 at 22:16











  • Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

    – pa4080
    Apr 8 at 9:15











  • The mount point wasn't in /tmp but I'll try mounting other places.

    – Bret Wallach
    Apr 8 at 22:29



















  • How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

    – Pasi Suominen
    Apr 6 at 22:16











  • Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

    – pa4080
    Apr 8 at 9:15











  • The mount point wasn't in /tmp but I'll try mounting other places.

    – Bret Wallach
    Apr 8 at 22:29

















How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

– Pasi Suominen
Apr 6 at 22:16





How about; en.wikipedia.org/wiki/Filesystem_in_Userspace

– Pasi Suominen
Apr 6 at 22:16













Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

– pa4080
Apr 8 at 9:15





Hello, as workaround, if the mountpoint is inside /tmp, try with different mountpoint outside.. I think your assumption this might have something to do with systemd since it's sort of like the PrivateTmp thing is right.

– pa4080
Apr 8 at 9:15













The mount point wasn't in /tmp but I'll try mounting other places.

– Bret Wallach
Apr 8 at 22:29





The mount point wasn't in /tmp but I'll try mounting other places.

– Bret Wallach
Apr 8 at 22:29










0






active

oldest

votes












Your Answer








StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});














draft saved

draft discarded


















StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1131753%2fnfs-mounting-from-apache2-php-worked-as-expected-under-ubuntu-16-but-not-ubuntu%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown

























0






active

oldest

votes








0






active

oldest

votes









active

oldest

votes






active

oldest

votes
















draft saved

draft discarded




















































Thanks for contributing an answer to Ask Ubuntu!


  • Please be sure to answer the question. Provide details and share your research!

But avoid …



  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.


To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1131753%2fnfs-mounting-from-apache2-php-worked-as-expected-under-ubuntu-16-but-not-ubuntu%23new-answer', 'question_page');
}
);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







-