X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=README;h=e0edd41f176db91165047e107c2b0a0db0de4cc3;hp=509b45f6fd1e4a0b0f4f7678cc9106b37aeb6a1f;hb=3e883473a0f36c220fc45ecf61d6878c9ac308b4;hpb=39c4ead2323b45bbe9866e0f97fd8dcfb8a0bede diff --git a/README b/README index 509b45f6f..e0edd41f1 100644 --- a/README +++ b/README @@ -30,16 +30,19 @@ AUTHOR: LICENSE: LGPLv2.1+ for all code - - except sd-daemon.[ch] and sd-readahead.[ch] which are MIT + - except sd-readahead.[ch] which is MIT - except src/shared/MurmurHash2.c which is Public Domain - except src/shared/siphash24.c which is CC0 Public Domain - except src/journal/lookup3.c which is Public Domain - except src/udev/* which is (currently still) GPLv2, GPLv2+ REQUIREMENTS: - Linux kernel >= 3.0 + Linux kernel >= 3.7 + Linux kernel >= 3.8 for Smack support + + Kernel Config Options: CONFIG_DEVTMPFS - CONFIG_CGROUPS (it's OK to disable all controllers) + CONFIG_CGROUPS (it is OK to disable all controllers) CONFIG_INOTIFY_USER CONFIG_SIGNALFD CONFIG_TIMERFD @@ -47,18 +50,16 @@ REQUIREMENTS: CONFIG_NET CONFIG_SYSFS CONFIG_PROC_FS - CONFIG_FHANDLE (mount and bind mount handling) + CONFIG_FHANDLE (libudev, mount and bind mount handling) - Linux kernel >= 3.8 for Smack support - - Udev will fail to work with the legacy layout: + udev will fail to work with the legacy sysfs layout: CONFIG_SYSFS_DEPRECATED=n Legacy hotplug slows down the system and confuses udev: CONFIG_UEVENT_HELPER_PATH="" - Userspace firmware loading is deprecated, will go away, and - sometimes causes problems: + Userspace firmware loading is not supported and should + be disabled in the kernel: CONFIG_FW_LOADER_USER_HELPER=n Some udev rules and virtualization detection relies on it: @@ -68,6 +69,9 @@ REQUIREMENTS: create additional symlinks in /dev/disk/ and /dev/tape: CONFIG_BLK_DEV_BSG + Required for PrivateNetwork in service units: + CONFIG_NET_NS + Optional but strongly recommended: CONFIG_IPV6 CONFIG_AUTOFS4_FS @@ -75,12 +79,16 @@ REQUIREMENTS: CONFIG_TMPFS_XATTR CONFIG_SECCOMP + Required for CPUShares in resource control unit settings + CONFIG_CGROUP_SCHED + CONFIG_FAIR_GROUP_SCHED + For systemd-bootchart, several proc debug interfaces are required: CONFIG_SCHEDSTATS CONFIG_SCHED_DEBUG For UEFI systems: - CONFIG_EFI_VARS + CONFIG_EFIVAR_FS CONFIG_EFI_PARTITION Note that kernel auditing is broken when used with systemd's @@ -89,27 +97,35 @@ REQUIREMENTS: runtime using the kernel command line option "audit=0", or turn it off at kernel compile time using: CONFIG_AUDIT=n + If systemd is compiled with libseccomp support on + architectures which do not use socketcall() and where seccomp + is supported (this effectively means x86-64 and ARM, but + excludes 32-bit x86!), then nspawn will now install a + work-around seccomp filter that makes containers boot even + with audit being enabled. This works correctly only on kernels + 3.14 and newer though. TL;DR: turn audit off, still. glibc >= 2.14 libcap + libseccomp >= 1.0.0 (optional) libblkid >= 2.20 (from util-linux) (optional) libkmod >= 15 (optional) PAM >= 1.1.2 (optional) libcryptsetup (optional) libaudit (optional) libacl (optional) - libattr (optional) libselinux (optional) liblzma (optional) - tcpwrappers (optional) + liblz4 >= 119 (optional) libgcrypt (optional) libqrencode (optional) libmicrohttpd (optional) libpython (optional) + libidn (optional) + gobject-introspection > 1.40.0 (optional) + elfutils >= 158 (optional) make, gcc, and similar tools - To sucessfully use --compat-libs, gcc >= 4.8 seems necessary. - During runtime, you need the following additional dependencies: @@ -133,8 +149,8 @@ REQUIREMENTS: gperf gtkdocize (optional) python (optional) + python-lxml (optional, but required to build the indices) sphinx (optional) - python-lxml (entirely optional) When systemd-hostnamed is used, it is strongly recommended to install nss-myhostname to ensure that, in a world of @@ -154,7 +170,7 @@ USERS AND GROUPS: even in the very early boot stages, where no other databases and network are available: - tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk + audio, cdrom, dialout, disk, input, kmem, lp, tape, tty, video During runtime, the journal daemon requires the "systemd-journal" system group to exist. New journal files will @@ -173,6 +189,39 @@ USERS AND GROUPS: exist. During execution this network facing service will drop privileges and assume this uid/gid for security reasons. + Similarly, the NTP daemon requires the "systemd-timesync" system + user and group to exist. + + Similarly, the network management daemon requires the + "systemd-network" system user and group to exist. + + Similarly, the name resolution daemon requires the + "systemd-resolve" system user and group to exist. + + Similarly, the kdbus dbus1 proxy daemon requires the + "systemd-bus-proxy" system user and group to exist. + +NSS: + systemd ships with three NSS modules: + + nss-myhostname resolves the local hostname to locally + configured IP addresses, as well as "localhost" to + 127.0.0.1/::1. + + nss-resolve enables DNS resolution via the systemd-resolved + DNS/LLMNR caching stub resolver "systemd-resolved". + + nss-mymachines enables resolution of all local containers + registered with machined to their respective IP addresses. + + To make use of these NSS modules, please add them to the + "hosts: " line in /etc/nsswitch.conf. The "resolve" module + should replace the glibc "dns" module in this file. + + The three modules should be used in the following order: + + hosts: files mymachines resolve myhostname + WARNINGS: systemd will warn you during boot if /etc/mtab is not a symlink to /proc/mounts. Please ensure that /etc/mtab is a @@ -189,6 +238,9 @@ WARNINGS: about this, since this kind of file system setup is not really supported anymore by the basic set of Linux OS components. + systemd requires that the /run mount point exists. systemd also + requires that /var/run is a a symlink to /run. + For more information on this issue consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken