Why do I have duplicate bind mounts?
Clash Royale CLAN TAG#URR8PPP
I'm curious if someone could explain to me what causes the odd scenario where we have a duplicate mount that appears cyclical on Centos 7 when binding a nfs directory?
In our hosting environment we chroot our users and in order to provide case specific access to some users we bind mount into external nfs directory.
If we mount multiple times we always end up with two seemingly identical mounts to the target with the only difference being one appears to be cyclical pointing to itself(?).
Both are active and show the same content and it doesn't appear to be a "ghost" directory.
Info to replicate:
fstab entries:
www:/protected /protected nfs defaults,_netdev,rw,mountproto=tcp 0 0
/protected/dir1 /$accthome/dir1 none defaults,bind,x-systemd.requires=/protected 0 0
df output looks good pre and post mounting with a single entry
www:/protected/dir1 504G 104G 375G 22% /$accthome/dir1
findmnt and mount both show a single entry
├─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
Run mount -a again and I end up with still a single df entry but duplicates in the findmnt and mount output. The only difference being in findmnt it looks to be a submount of the initial mount?
├─/protected/dir1 www:/$accthome/dir1 nfs
│ └─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
www:/protected/dir1 on $accthome/dir1 type nfs
centos mount nfs bind
asked Jan 16 at 16:31
AndrewAndrew
1013
add a comment |
I'm curious if someone could explain to me what causes the odd scenario where we have a duplicate mount that appears cyclical on Centos 7 when binding a nfs directory?
In our hosting environment we chroot our users and in order to provide case specific access to some users we bind mount into external nfs directory.
If we mount multiple times we always end up with two seemingly identical mounts to the target with the only difference being one appears to be cyclical pointing to itself(?).
Both are active and show the same content and it doesn't appear to be a "ghost" directory.
Info to replicate:
fstab entries:
www:/protected /protected nfs defaults,_netdev,rw,mountproto=tcp 0 0
/protected/dir1 /$accthome/dir1 none defaults,bind,x-systemd.requires=/protected 0 0
df output looks good pre and post mounting with a single entry
www:/protected/dir1 504G 104G 375G 22% /$accthome/dir1
findmnt and mount both show a single entry
├─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
Run mount -a again and I end up with still a single df entry but duplicates in the findmnt and mount output. The only difference being in findmnt it looks to be a submount of the initial mount?
├─/protected/dir1 www:/$accthome/dir1 nfs
│ └─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
www:/protected/dir1 on $accthome/dir1 type nfs
centos mount nfs bind
asked Jan 16 at 16:31
AndrewAndrew
1013
add a comment |
I'm curious if someone could explain to me what causes the odd scenario where we have a duplicate mount that appears cyclical on Centos 7 when binding a nfs directory?
In our hosting environment we chroot our users and in order to provide case specific access to some users we bind mount into external nfs directory.
If we mount multiple times we always end up with two seemingly identical mounts to the target with the only difference being one appears to be cyclical pointing to itself(?).
Both are active and show the same content and it doesn't appear to be a "ghost" directory.
Info to replicate:
fstab entries:
www:/protected /protected nfs defaults,_netdev,rw,mountproto=tcp 0 0
/protected/dir1 /$accthome/dir1 none defaults,bind,x-systemd.requires=/protected 0 0
df output looks good pre and post mounting with a single entry
www:/protected/dir1 504G 104G 375G 22% /$accthome/dir1
findmnt and mount both show a single entry
├─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
Run mount -a again and I end up with still a single df entry but duplicates in the findmnt and mount output. The only difference being in findmnt it looks to be a submount of the initial mount?
├─/protected/dir1 www:/$accthome/dir1 nfs
│ └─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
www:/protected/dir1 on $accthome/dir1 type nfs
centos mount nfs bind
asked Jan 16 at 16:31
AndrewAndrew
1013
I'm curious if someone could explain to me what causes the odd scenario where we have a duplicate mount that appears cyclical on Centos 7 when binding a nfs directory?
In our hosting environment we chroot our users and in order to provide case specific access to some users we bind mount into external nfs directory.
If we mount multiple times we always end up with two seemingly identical mounts to the target with the only difference being one appears to be cyclical pointing to itself(?).
Both are active and show the same content and it doesn't appear to be a "ghost" directory.
Info to replicate:
fstab entries:
www:/protected /protected nfs defaults,_netdev,rw,mountproto=tcp 0 0
/protected/dir1 /$accthome/dir1 none defaults,bind,x-systemd.requires=/protected 0 0
df output looks good pre and post mounting with a single entry
www:/protected/dir1 504G 104G 375G 22% /$accthome/dir1
findmnt and mount both show a single entry
├─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
Run mount -a again and I end up with still a single df entry but duplicates in the findmnt and mount output. The only difference being in findmnt it looks to be a submount of the initial mount?
├─/protected/dir1 www:/$accthome/dir1 nfs
│ └─/protected/dir1 www:/$accthome/dir1 nfs
and
www:/protected/dir1 on $accthome/dir1 type nfs
www:/protected/dir1 on $accthome/dir1 type nfs
centos mount nfs bind
centos mount nfs bind
asked Jan 16 at 16:31
AndrewAndrew
1013
asked Jan 16 at 16:31
AndrewAndrew
1013
edited Jan 16 at 16:40
Andrew
asked Jan 16 at 16:31
AndrewAndrew
1013
asked Jan 16 at 16:31
AndrewAndrew
1013
asked Jan 16 at 16:31
AndrewAndrew
1013
1013
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "106"
;
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: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
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
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494878%2fwhy-do-i-have-duplicate-bind-mounts%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
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- 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.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f494878%2fwhy-do-i-have-duplicate-bind-mounts%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
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