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Use a tmpfs for /var

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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
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17
pkg/init/bin/rc.init
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@@ -1,11 +1,18 @@
#!/bin/sh
# mount filesystems
# mount proc filesystem
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 /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 -n -t devtmpfs dev /dev -o nosuid,noexec,relatime,size=10m,nr_inodes=248418,mode=755
# devices
@@ -101,14 +108,6 @@ ip link set lo up
# 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
# 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
mount --make-rshared /