journal: restore watchdog support

journald: never block when sending messages on NOTIFY_SOCKET socket Otherwise we might run into deadlocks, when journald blocks on the notify socket on PID 1, and PID 1 blocks on IPC to dbus-daemon and dbus-daemon blocks on logging to journald. Break this cycle by making sure that journald never ever blocks on PID 1. Note that this change disables support for event loop watchdog support, as these messages are sent in blocking style by sd-event. That should not be a big loss though, as people reported frequent problems with the watchdog hitting journald on excessively slow IO. Fixes: #1505.

units: increase watchdog timeout to 3min for all our services Apparently, disk IO issues are more frequent than we hope, and 1min waiting for disk IO happens, so let's increase the watchdog timeout a bit, for all our services. See #1353 for an example where this triggers.

Revert "units: add SecureBits" This reverts commit 6a716208b346b742053cfd01e76f76fb27c4ea47. Apparently this doesn't work. http://lists.freedesktop.org/archives/systemd-devel/2015-February/028212.html

units: add SecureBits No setuid programs are expected to be executed, so add SecureBits=noroot noroot-locked to unit files.

journal: bump RLIMIT_NOFILE when journal files to 16K (if possible) When there are a lot of split out journal files, we might run out of fds quicker then we want. Hence: bump RLIMIT_NOFILE to 16K if possible. Do these even for journalctl. On Fedora the soft RLIMIT_NOFILE is at 1K, the hard at 4K by default for normal user processes, this code hence bumps this up for users to 4K. https://bugzilla.redhat.com/show_bug.cgi?id=1179980

journald: allow restarting journald without losing stream connections Making use of the fd storage capability of the previous commit, allow restarting journald by serilizing stream state to /run, and pushing open fds to PID 1.

units: make systemd-journald.service Type=notify It already calls sd_notify(), so it looks like an oversight. Without it, its ordering to systemd-journal-flush.service is non-deterministic and the SIGUSR1 from flushing may kill journald before it has its signal handlers set up. https://bugs.freedesktop.org/show_bug.cgi?id=85871 https://bugzilla.redhat.com/show_bug.cgi?id=1159641

journald: if available pull audit messages from the kernel into journal logs

journald: add CAP_MAC_OVERRIDE in journald for SMACK issue systemd-journald check the cgroup id to support rate limit option for every messages. so journald should be available to access cgroup node in each process send messages to journald. In system using SMACK, cgroup node in proc is assigned execute label as each process's execute label. so if journald don't want to denied for every process, journald should have all of access rule for all process's label. It's too heavy. so we could give special smack label for journald te get all accesses's permission. '^' label. When assign '^' execute smack label to systemd-journald, systemd-journald need to add CAP_MAC_OVERRIDE capability to get that smack privilege. so I want to notice this information and set default capability to journald whether system use SMACK or not. because that capability affect to only smack enabled kernel

core: rename ReadOnlySystem= to ProtectSystem= and add a third value for also mounting /etc read-only Also, rename ProtectedHome= to ProtectHome=, to simplify things a bit. With this in place we now have two neat options ProtectSystem= and ProtectHome= for protecting the OS itself (and optionally its configuration), and for protecting the user's data.

journald: move /dev/log socket to /run This way we can make the socket also available for sandboxed apps that have their own private /dev. They can now simply symlink the socket from /dev.

core: add new ReadOnlySystem= and ProtectedHome= settings for service units ReadOnlySystem= uses fs namespaces to mount /usr and /boot read-only for a service. ProtectedHome= uses fs namespaces to mount /home and /run/user inaccessible or read-only for a service. This patch also enables these settings for all our long-running services. Together they should be good building block for a minimal service sandbox, removing the ability for services to modify the operating system or access the user's private data.

journald: port to sd-event and enable watchdog support

journal: don't pull in flush service from journald service In the initrd we don't need the flush service hence don't attempt to pull it in.

unit: make sure structured logging is available before we enter the main boot phase

units: don't enforce a holdoff time for journald, logind, udevd These services should be restarted as quickly as possible if they fail, and the extra safety net of the holdoff time is not necessary.

journal: replace implicit flushing of journal by explicit one The old automatism that the flushing of the journal from /run to /var was triggered by the appearance of /var/log/journal is broken if that directory is mounted from another host and hence always available to be useful as mount point. To avoid probelsm with this, introduce a new unit that is explicitly orderer after all mounte files systems and triggers the flushing.

units: automatically respawn the core services

units: fix man section

man: document systemd-journal

units: introduce new Documentation= field and make use of it everywhere This should help making the boot process a bit easier to explore and understand for the administrator. The simple idea is that "systemctl status" now shows a link to documentation alongside the other status and decriptionary information of a service. This patch adds the necessary fields to all our shipped units if we have proper documentation for them.

relicense to LGPLv2.1 (with exceptions) We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.

journal: add CAP_SETUID and CAP_SETGID to capabilities for journald, so that we can fake SCM_CREDENTIALS

journal: limit caps we pass to journald

journald: start the journal after the syslog socket, so that the syslog socket queues syslog messages from early boot on

journal: add unit files and shared library glue