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usertmp_donotdelete File

Discussion in 'Install & Upgrades or Pre-Install Questions' started by Jimmy, Nov 11, 2018.

  1. Jimmy

    Jimmy Well-Known Member

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    Please fill in any relevant information that applies to you:
    • CentOS Version: CentOS 7 64bit ?
    • Centmin Mod Version Installed: 123.09beta01
    • Nginx Version Installed: i.e. 1.15.6
    • PHP Version Installed: 7.2.15
    • MariaDB MySQL Version Installed: i.e. 10.0.x or 10.1.xx or 10.2.xx
    I was curious if it was normal to have a 6GB file in my home directory called usertmp_donotdelete. The file was created tonight after an cm, nginx, and php upgrade (the machine hasn't been on in a few days).


    Not sure what this file is for??? The server doesn't have anything on it but a bunch of 10.0.0.XXX domains which are local dev domains. It a VPS on virtualbox.
     
  2. eva2000

    eva2000 Administrator Staff Member

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    that file is your /tmp mount file that centmin mod creates at initial install time hence DO NOT delete or /tmp will not work

    size of disk space allocated for /tmp depends on centmin mod detected /home free disk space
     
  3. Jimmy

    Jimmy Well-Known Member

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    Is there somewhere that is set? My dev server is the same as my other servers (online) and none of the other servers have that file.
     
  4. eva2000

    eva2000 Administrator Staff Member

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    only non-OpenVZ servers would of have it i.e. KVM/XEN or dedicated. OpenVZ would skip such setup due to restrictions.
     
  5. Jimmy

    Jimmy Well-Known Member

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    I have 4 servers:

    1. OVH dedicated - no file in /home
    2. SSDnodes - no file in /home
    3. SSDnodes - no file in /home
    4. VPS local on Virtualbox - 6GB file in home.

    My /home directory on all machines was setup that /root has all the space (deleted the home when setting up the disks initally) so there should be plenty of space on all machines
     
    Last edited: Nov 11, 2018
  6. eva2000

    eva2000 Administrator Staff Member

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    You can check /etc/fstab for /tmp entry
    Code (Text):
    cat /etc/fstab | grep '\/tmp'
    

    example
    Code (Text):
    cat /etc/fstab | grep '\/tmp'
    /home/usertmp_donotdelete /tmp ext4 loop,rw,noexec,nosuid 0 0
    

    You can inspect the initial install log for centmin mod for keyword /tmp to see how it was setup via command
    Code (Text):
    grep -rni -A30 '\/tmp' /root/centminlogs/centminmod_123.09beta01.*install.log
    

    example
    Code (Text):
    grep -rni -A30 '\/tmp' /root/centminlogs/centminmod_123.09beta01.*install.log
    
    grep -rni -A30 '\/tmp' /root/centminlogs/centminmod_123.09beta01.*install.log 
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log:1181:Centmin Mod secure /tmp # Fri Oct 26 22:44:37 UTC 2018
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1182-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log:1183:* Secured /tmp and /var/tmp
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1184-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log:1185:CentOS 7 Setup /tmp
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1186-CentOS 7 + non-OpenVZ virtualisation detected
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1187-disabled
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1188-6291456+0 records in
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1189-6291456+0 records out
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1190-6442450944 bytes (6.4 GB) copied, 49.1085 s, 131 MB/s
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1191-mke2fs 1.42.9 (28-Dec-2013)
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1192-/home/usertmp_donotdelete is not a block special device.
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1193-Proceed anyway? (y,n) Discarding device blocks: done                           
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1194-Filesystem label=
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1195-OS type: Linux
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1196-Block size=4096 (log=2)
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1197-Fragment size=4096 (log=2)
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1198-Stride=0 blocks, Stripe width=0 blocks
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1199-393216 inodes, 1572864 blocks
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1200-78643 blocks (5.00%) reserved for the super user
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1201-First data block=0
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1202-Maximum filesystem blocks=1610612736
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1203-48 block groups
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1204-32768 blocks per group, 32768 fragments per group
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1205-8192 inodes per group
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1206-Superblock backups stored on blocks: 
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1207-  32768, 98304, 163840, 229376, 294912, 819200, 884736
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1208-
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1209-Allocating group tables: done                           
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1210-Writing inode tables: done                           
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1211-Creating journal (32768 blocks): done
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1212-Writing superblocks and filesystem accounting information: done 
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1213-
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1214-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_261018-224230_install.log-1215-* Setting preferred localtime for VPS
    

    or check /root/centminlogs/securedtmp.log which is populated at initial centmin mod install time
    Code (Text):
    cat /root/centminlogs/securedtmp.log 
    Centmin Mod secure /tmp # Fri Oct 26 22:44:37 UTC 2018
    *************************************************
    * Secured /tmp and /var/tmp
    *************************************************
    CentOS 7 Setup /tmp
    CentOS 7 + non-OpenVZ virtualisation detected
    disabled
    6291456+0 records in
    6291456+0 records out
    6442450944 bytes (6.4 GB) copied, 49.1085 s, 131 MB/s
    mke2fs 1.42.9 (28-Dec-2013)
    /home/usertmp_donotdelete is not a block special device.
    Proceed anyway? (y,n) Discarding device blocks: done                           
    Filesystem label=
    OS type: Linux
    Block size=4096 (log=2)
    Fragment size=4096 (log=2)
    Stride=0 blocks, Stripe width=0 blocks
    393216 inodes, 1572864 blocks
    78643 blocks (5.00%) reserved for the super user
    First data block=0
    Maximum filesystem blocks=1610612736
    48 block groups
    32768 blocks per group, 32768 fragments per group
    8192 inodes per group
    Superblock backups stored on blocks: 
            32768, 98304, 163840, 229376, 294912, 819200, 884736
    
    Allocating group tables: done                           
    Writing inode tables: done                           
    Creating journal (32768 blocks): done
    Writing superblocks and filesystem accounting information: done 
    
     
  7. Jimmy

    Jimmy Well-Known Member

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    Here is my local:
    Code:
    # cat /etc/fstab | grep '\/tmp'
    /home/usertmp_donotdelete /tmp ext4 loop,rw,noexec,nosuid 0 0
    
    Here is my SSDnodes:
    Code:
    # cat /etc/fstab | grep '\/tmp'
    tmpfs /tmp tmpfs rw,noexec,nosuid 0 0
    
    This is from my local virtualbox machine:
    Code:
    # grep -rni -A30 '\/tmp' /root/centminlogs/centminmod_123.09beta01.*install.log
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log:1174:Centmin Mod secure /tmp # Sat Oct 27 22:56:34 EDT 2018
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1175-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log:1176:* Secured /tmp and /var/tmp
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1177-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log:1178:CentOS 7 Setup /tmp
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1179-CentOS 7 + non-OpenVZ virtualisation detected
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1180-disabled
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1181-6291456+0 records in
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1182-6291456+0 records out
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1183-6442450944 bytes (6.4 GB) copied, 14.0302 s, 459 MB/s
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1184-mke2fs 1.42.9 (28-Dec-2013)
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1185-/home/usertmp_donotdelete is not a block special device.
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1186-Proceed anyway? (y,n) Discarding device blocks: done                         
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1187-Filesystem label=
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1188-OS type: Linux
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1189-Block size=4096 (log=2)
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1190-Fragment size=4096 (log=2)
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1191-Stride=0 blocks, Stripe width=0 blocks
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1192-393216 inodes, 1572864 blocks
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1193-78643 blocks (5.00%) reserved for the super user
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1194-First data block=0
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1195-Maximum filesystem blocks=1610612736
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1196-48 block groups
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1197-32768 blocks per group, 32768 fragments per group
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1198-8192 inodes per group
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1199-Superblock backups stored on blocks:
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1200-    32768, 98304, 163840, 229376, 294912, 819200, 884736
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1201-
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1202-Allocating group tables: done                         
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1203-Writing inode tables: done                         
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1204-Creating journal (32768 blocks): done
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1205-Writing superblocks and filesystem accounting information: done
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1206-
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1207-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b063_271018-225543_install.log-1208-* Setting preferred localtime for VPS
    
    This is from my SSDnodes:
    Code:
    # grep -rni -A30 '\/tmp' /root/centminlogs/centminmod_123.09beta01.*install.log
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log:1436:Centmin Mod secure /tmp # Wed Jul 25 13:52:55 EDT 2018
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log-1437-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log:1438:* Secured /tmp and /var/tmp
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log-1439-*************************************************
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log:1440:CentOS 7 Setup /tmp
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log-1441-CentOS 7 + non-OpenVZ virtualisation detected
    /root/centminlogs/centminmod_123.09beta01.b040_250718-135126_install.log-1442-disabled
    
    I don't mind the 6GB file on the server, just was curious why it was on one server and not the others. All the install were using the beta 7.2 one line install. All drives are setup not to include /home as a separate partition.
     
    Last edited: Nov 11, 2018
  8. eva2000

    eva2000 Administrator Staff Member

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    all look to have /tmp setup but maybe they didn't mount for some reason. If you rebooted/shutdown/restart server should mount them which is probably what you see when you mentioned server has been shutdown for days ???

    when you run
    Code (Text):
    mount -a
    df -hT /tmp
    

    what do you get for output
     
  9. Jimmy

    Jimmy Well-Known Member

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    Here is the output from the local dev server:
    Code:
    # mount -a
    # df -hT /tmp
    Filesystem     Type  Size  Used Avail Use% Mounted on
    /dev/loop0     ext4  5.8G   25M  5.5G   1% /tmp
    
    I can reboot if you want.
     
  10. Jimmy

    Jimmy Well-Known Member

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    Here is the output from SSDnodes:
    Code:
    # mount -a
    # df -hT /tmp
    Filesystem     Type   Size  Used Avail Use% Mounted on
    tmpfs          tmpfs   16G  1.2M   16G   1% /tmp
    
     
  11. eva2000

    eva2000 Administrator Staff Member

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    looks about right there when you have more than 16GB (actually >16000001 bytes) memory, /tmp uses ramdisk tmpfs instead of the /home/usertmp_donotdelete file

    centmin mod's goal at initial install time is for optimal sized /tmp as incorrect or small size can cause problems especially on low memory VPS i.e. 512MB ram VPS on CentOS 7 would usually have ~256MB tmpfs ram disk for /tmp on non-Centmin Mod systems. Centmin Mod will detect that and size an on disk /tmp that is larger to properly accomodate optimal usage based on detected and calculated disk free space on /home.

    At >16GB memory, you'd have ~8GB ram disk tmpfs for /tmp so don't need an on disk file and can get CentOS 7 set it's /tmp on tmpfs ram disk.
     
    Last edited: Nov 11, 2018
  12. Jimmy

    Jimmy Well-Known Member

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    Sounds good. I was transferring over some large files which I was going to dump in the /home dir on my local. I saw the file and wondered what it was.

    Thanks for your help in understand this!
     
  13. MaximilianKohler

    MaximilianKohler Member

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    I just installed CMM on alma9 and my output for the first command is blank:
    Code:
    cat /etc/fstab | grep '\/tmp'
    
    Code:
    mount -a
    df -hT /tmp
    Filesystem     Type  Size  Used Avail Use% Mounted on
    /dev/loop0     ext4  3.9G  152K  3.7G   1% /tmp
    
    Alma9 came without a swap file, so I created one (prior to installing CMM) per this info.

    Is the 4 GB usertmp_donotdelete necessary?
     
  14. eva2000

    eva2000 Administrator Staff Member

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    Still needed
    Code (Text):
    ls -lah /home/usertmp_donotdelete
    -rw-r--r-- 1 root root 4.0G Jul  6 16:46 /home/usertmp_donotdelete
    

    But only if you have less than 15.25GB of memory installed. If you have more than 15.25GB of memory, /home/usertmp_donotdelete isn't created if disk space is adequate as is for /tmp should. The original aim is still the same from https://community.centminmod.com/threads/usertmp_donotdelete-file.16005/#post-68497 for lower memory/disk systems.

    But how it's used differs so no longer from /etc/fstab but via mount-loop.service service. I believe I changed this setup due to @Matt reported issue at https://community.centminmod.com/th...ocky8-causing-ro-file-system-on-reboot.23763/

    i.e. /tmp setup as a /dev/loop0
    Code (Text):
    df -hT
    Filesystem     Type      Size  Used Avail Use% Mounted on
    devtmpfs       devtmpfs  4.0M     0  4.0M   0% /dev
    tmpfs          tmpfs     3.8G     0  3.8G   0% /dev/shm
    tmpfs          tmpfs     1.6G  8.8M  1.5G   1% /run
    /dev/vda4      xfs        79G  9.0G   70G  12% /
    /dev/vda3      xfs       960M  299M  662M  32% /boot
    /dev/vda2      vfat      200M  7.1M  193M   4% /boot/efi
    tmpfs          tmpfs     769M     0  769M   0% /run/user/0
    /dev/loop0     ext4      3.9G  116K  3.7G   1% /tmp
    

    via /etc/systemd/system/mount-loop.service
    Code (Text):
    [Unit]
    Description=Mount loop device for /tmp
    After=local-fs.target
    Requires=local-fs.target
    
    [Service]
    ExecStart=/usr/local/bin/mount-loop.sh
    ExecStop=/usr/bin/umount /tmp
    Type=oneshot
    RemainAfterExit=yes
    
    [Install]
    WantedBy=multi-user.target
    
     
  15. eva2000

    eva2000 Administrator Staff Member

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    how did you install AlmaLinux 9 and Centmin Mod? swap should of been configured though could of been you installed on earlier Centmin Mod 130.00beta01 during beta before the changes were made. Though recall should of still created swap.
    Code (Text):
    free -mlt
                   total        used        free      shared  buff/cache   available
    Mem:            7682        1804        5297          15         889        5877
    Low:            7682        2384        5297
    High:              0           0           0
    Swap:           4095           0        4095
    Total:         11778        1804        9393
    
     
  16. MaximilianKohler

    MaximilianKohler Member

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    I installed Alma9 via Hetzner new server creation. I installed CMM 140.00beta01 via centminmod.com/install.html

    Code:
    yum -y update
    curl -O https://centminmod.com/betainstaller82.sh && chmod 0700 betainstaller82.sh && bash betainstaller82.sh
    
    Code:
    ls -lah /home/usertmp_donotdelete
    -rw-r--r-- 1 root root 4.0G Jul  6 13:40 /home/usertmp_donotdelete
    
    Code:
    ===============================================================================
                   total        used        free      shared  buff/cache   available
    Mem:            3563         905         813         150        2233        2658
    Swap:           4095           7        4088
    ===============================================================================
    Filesystem     Type      Size  Used Avail Use% Mounted on
    devtmpfs       devtmpfs  4.0M     0  4.0M   0% /dev
    tmpfs          tmpfs     1.8G  1.1M  1.8G   1% /dev/shm
    tmpfs          tmpfs     713M  8.7M  705M   2% /run
    /dev/sda1      ext4       38G   12G   25G  33% /
    /dev/sda14     vfat       64M  7.1M   57M  12% /boot/efi
    /dev/loop0     ext4      3.9G  176K  3.7G   1% /tmp
    tmpfs          tmpfs     357M  4.0K  357M   1% /run/user/0
    
     
  17. eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    That is expected output :)
     
  18. MaximilianKohler

    MaximilianKohler Member

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    So besides the OS 4 GB swap file, CMM needs to create and use another permanent 4 GB swap file?
     
  19. eva2000

    eva2000 Administrator Staff Member

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    Nginx 1.31.x
    MariaDB 10.x/11.4+/12.3+
    Yup initial installer does that now