Bootlogd records boot messages.
You do this by editing /etc/default/bootlogd, this is not enabled by default:
# Run bootlogd at startup ? BOOTLOGD_ENABLE=yes
When the system is restarted, userspace messages will be logged to /var/log/boot.
As from Wheezy, the bootlog package is automatically started as a daemon in the normal way (with a sys-V like init.d script). No config file any more.
Reading /var/log/boot file
Parts of a boot message sometimes can be wrapped with an ASCII color sequences, e.g. "failed" string after unsuccessful init action. bootlogd writes ^[ characters to its log file instead of actual ASCII escape character. To view colored strings via less as expected, you must replace ^[ characters with actual escape character and tell less to output ASCII color escape sequences in "raw" form:
sed $'s/\^\[/\E/g' /var/log/boot | less -R
On bootlogd version 2.88 (Wheezy), a date stamp is added in front of the boot message.Consequently, the ok, fail etc. messages overwrite part of the date stamp. The cursor repositioning escape sequence [1G must be replaced by [27G to offset the cursor before printing the ok, fail, info etc. strings.
sed $'s/\^\[/\E/g;s/\[1G\[/\[27G\[/' /var/log/boot