github/linuxkit
1
0
Fork 0
mirror of https://github.com/linuxkit/linuxkit.git synced 2025-07-20 17:49:10 +00:00
Code Issues Projects Releases Wiki Activity

Use a tmpfs for /var

Browse Source 
Previously we were cheating and remounting /var `rw` but this does not
work if the filesystem is really read only. Nount a tmpfs, which may
be overmounted later by a persistent filesystem.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This commit is contained in:
Justin Cormack 2017-07-28 13:04:14 +01:00
parent 5ea2eaead1
commit 2c20ee2f8a
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
pkg/init/bin/rc.init
View File

@ -1,11 +1,18 @@
#!/bin/sh #!/bin/sh
# mount filesystems # mount proc filesystem
mount -n -t proc proc /proc -o nodev,nosuid,noexec,relatime mount -n -t proc proc /proc -o nodev,nosuid,noexec,relatime
# remount rootfs as readonly
mount -o remount,ro /
# mount tmpfs for /tmp and /run
mount -n -t tmpfs tmpfs /run -o nodev,nosuid,noexec,relatime,size=10%,mode=755 mount -n -t tmpfs tmpfs /run -o nodev,nosuid,noexec,relatime,size=10%,mode=755
mount -n -t tmpfs tmpfs /tmp -o nodev,nosuid,noexec,relatime,size=10%,mode=1777 mount -n -t tmpfs tmpfs /tmp -o nodev,nosuid,noexec,relatime,size=10%,mode=1777
# mount tmpfs for /var. This may be overmounted with a persistent filesystem later
mount -n -t tmpfs tmpfs /var -o nodev,nosuid,noexec,relatime,size=50%,mode=755
# mount devfs # mount devfs
mount -n -t devtmpfs dev /dev -o nosuid,noexec,relatime,size=10m,nr_inodes=248418,mode=755 mount -n -t devtmpfs dev /dev -o nosuid,noexec,relatime,size=10m,nr_inodes=248418,mode=755
# devices # devices
@ -101,14 +108,6 @@ ip link set lo up
# for containerizing dhcpcd and other containers that need writable /etc/resolv.conf # for containerizing dhcpcd and other containers that need writable /etc/resolv.conf
[ -L /etc/resolv.conf ] && mkdir -p $(dirname $(readlink -n /etc/resolv.conf)) && touch /etc/resolv.conf [ -L /etc/resolv.conf ] && mkdir -p $(dirname $(readlink -n /etc/resolv.conf)) && touch /etc/resolv.conf
# remount rootfs as readonly
mount -o remount,ro /
# make /var writeable and shared
mount -o bind /var /var
mount -o remount,rw,nodev,nosuid,noexec,relatime /var /var
mount --make-rshared /var
# make / rshared # make / rshared
mount --make-rshared / mount --make-rshared /