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- tmpfs
- -----
-
- Tmpfs can be used as virtual memory filesystem. glibc 2.2 and above
- expects a tmpfs to be mounted at /dev/shm for POSIX shared memory,
- this is done automatically by /etc/init.d/mountdevsubfs.sh early in
- the boot process. You can limit tmpfs max size by setting the
- SHM_SIZE variable to a desired size in the /etc/default/tmpfs file
- to prevent tmpfs from using up all system memory.
-
- A tmpfs can also be mounted over /var/run/ and /var/lock/. This can
- be achieved by setting the RAMRUN and RAMLOCK variables to "yes" in
- the /etc/default/rcS file. A size limit for the tmpfs filesystem
- mounted over /var/run/ and /var/lock/ can be set via the RUN_SIZE
- and LOCK_SIZE variables in the /etc/default/tmpfs file.
-
- If TMPFS_SIZE is set in /etc/default/tmpfs, it will be used as the
- default value for SHM_SIZE, RUN_SIZE and LOCK_SIZE. Otherwise, kernel
- defaults are used.
-
-
- sendsigs process omission interface
- -----------------------------------
-
- Since initscripts package version 2.86.ds1-48, /etc/init.d/sendsigs
- is able to omit processes from being killed by killall5(8). Process
- id's listed in /var/run/sendsigs.omit, /lib/init/rw/sendsigs.omit or
- any file in the /lib/init/rw/sendsigs.omit.d/ directory will be
- omitted by sendsigs.
-
- The recommended practise for adding a process id for omission is to
- create a file in /lib/init/rw/sendsigs.omit.d/<package name>
- containing the process id that is to be omitted by sendsigs.
-
- This feature is only to be used for processes that need to be
- running when remote file systems are umounted, and that have
- current working directory set to a directory in the root file system.
-
-
- /sys in /etc/fstab
- ------------------
-
- If the mount point /sys/ has an entry in /etc/fstab (which is not
- required, it will be mounted in any case), the entry must be:
-
- sysfs /sys sysfs rw,nosuid,nodev,noexec 0 0
-
- The reason is that the entry in fstab needs to match the entry
- generated by the mountkernfs.sh and mtab.sh scripts. If it does not,
- the system will complain with this message during boot:
-
- Will now mount local filesystems:mount: /sys already mounted or /sys busy
- mount: according to mtab, sysfs is already mounted on /sys
- failed
-