Ahoy Into the Terminal Viewers! Here's my update on why my snapshot example was a complete trainwreck! It turns out, it's because I had made the snapshot of my / filesystem. Essentially, what was happening is I had a snapshot that I was then trying to mount onto the source of that snapshot. Yet another reason why we should separate fileystems for 'flexibility' and 'resiliancy' like we learned in some of the Security themed episodes 🙂 I made a snapshot of my /dev/newvolgroup/tmp logical volume and was able to successfully mount and access it (since I wasn't trying to essentially mount the snapshot into the source of the snapshot by using a different logical volume).
Hi, I would like to see High Availability NFS on High Availability storage based on CEPHFS or any other solution on one of your future podcast series. Best,
Thanks for the topic suggestion. This series is focused on RHEL, so I don't know that we'd do an episode on CEPH. HA may be interesting though. I'll put it in our episode planning documentation as a future idea!
user home directory is mounted on demand on any server , suddenly user getting permission denied although he is the owner of the his directory and all the permissions are good and after re applying existing ownership and permissions then he can able create the files , what may be the issue
Not having access to the machines in question nor any additional dianostics nor the commands used to 're apply' the ownership and permissions, I'm just guessing. My first guess is that the user ID (UID) on the machines this user is using is not consistent across the infrastucture. If the person created the files on a machine where they are UID 1001, but on this machine they are UID 1002, that would definitely cause this type of problem. Most people solve this by using a central identity and authentication server (like Identity Manager [IdM] or LDAP or Active Directory). The central server is responsible for holding user account definitions and credentials, then, any machine using this central location would get the same information for the users interacting with the machine. If you are not able to have a central system for managing user identities and authentication, then you want to make sure that the user is assigned the same UID on each machine where the account is created. Remember, when creating an account, the default would be to use the first available UID over 1000 (on RHEL7 and later). So if the accounts on all machines are not both identical and created in an identical order, you will end up with the same usernames, but different UIDs for those users. There is an option with useradd (-u) to specify the account's UID number if you want to force it to be a specific value.
user was AD user , not local created user and home directory of user is auto mount on any server on infrastructure and I used chmod and chown with same existing permission and ownership on one server where permission getting denied for user
When I was using RHEL for this, I'd use something like a wacom tablet + gimp (or Inkscape) But while I use RHEL for all our demo systems, the machine I'm using to drive those demos and the livestream is a Mac. To do the 'whiteboarding' in this episode, I used an iPad Pro as a secondary display for my Mac so that I could use the pencil on the hand-held to do the drawing and whatnots. (If we can really describe my artistic ability as 'drawing'.) I use the app, Tayasui Sketches as the application which I then export to the iPad Pro secondary display.
Ahoy Into the Terminal Viewers! Here's my update on why my snapshot example was a complete trainwreck!
It turns out, it's because I had made the snapshot of my / filesystem. Essentially, what was happening is I had a snapshot that I was then trying to mount onto the source of that snapshot. Yet another reason why we should separate fileystems for 'flexibility' and 'resiliancy' like we learned in some of the Security themed episodes 🙂
I made a snapshot of my /dev/newvolgroup/tmp logical volume and was able to successfully mount and access it (since I wasn't trying to essentially mount the snapshot into the source of the snapshot by using a different logical volume).
Learn something every day, even if your already a master :)
Hi, I would like to see High Availability NFS on High Availability storage based on CEPHFS or any other solution on one of your future podcast series.
Best,
Thanks for the topic suggestion. This series is focused on RHEL, so I don't know that we'd do an episode on CEPH. HA may be interesting though. I'll put it in our episode planning documentation as a future idea!
user home directory is mounted on demand on any server , suddenly user getting permission denied although he is the owner of the his directory and all the permissions are good and after re applying existing ownership and permissions then he can able create the files , what may be the issue
Not having access to the machines in question nor any additional dianostics nor the commands used to 're apply' the ownership and permissions, I'm just guessing.
My first guess is that the user ID (UID) on the machines this user is using is not consistent across the infrastucture. If the person created the files on a machine where they are UID 1001, but on this machine they are UID 1002, that would definitely cause this type of problem. Most people solve this by using a central identity and authentication server (like Identity Manager [IdM] or LDAP or Active Directory). The central server is responsible for holding user account definitions and credentials, then, any machine using this central location would get the same information for the users interacting with the machine.
If you are not able to have a central system for managing user identities and authentication, then you want to make sure that the user is assigned the same UID on each machine where the account is created. Remember, when creating an account, the default would be to use the first available UID over 1000 (on RHEL7 and later). So if the accounts on all machines are not both identical and created in an identical order, you will end up with the same usernames, but different UIDs for those users. There is an option with useradd (-u) to specify the account's UID number if you want to force it to be a specific value.
Thanks for watching and let us know if Scott's response answered your question.
user was AD user , not local created user and home directory of user is auto mount on any server on infrastructure and I used chmod and chown with same existing permission and ownership on one server where permission getting denied for user
I have to know what whiteboard app you're using for RHEL??
When I was using RHEL for this, I'd use something like a wacom tablet + gimp (or Inkscape)
But while I use RHEL for all our demo systems, the machine I'm using to drive those demos and the livestream is a Mac. To do the 'whiteboarding' in this episode, I used an iPad Pro as a secondary display for my Mac so that I could use the pencil on the hand-held to do the drawing and whatnots. (If we can really describe my artistic ability as 'drawing'.) I use the app, Tayasui Sketches as the application which I then export to the iPad Pro secondary display.
Thanks for watching Angela, and thank you for the quick response, Scott!