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d657c51f | 1 | systemd System and Service Manager |
31cee6f6 LP |
2 | |
3 | DETAILS: | |
4 | http://0pointer.de/blog/projects/systemd.html | |
5 | ||
6 | WEB SITE: | |
7 | http://www.freedesktop.org/wiki/Software/systemd | |
8 | ||
9 | GIT: | |
9fa2f410 KS |
10 | git://anongit.freedesktop.org/systemd/systemd |
11 | ssh://git.freedesktop.org/git/systemd/systemd | |
31cee6f6 LP |
12 | |
13 | GITWEB: | |
9fa2f410 | 14 | http://cgit.freedesktop.org/systemd/systemd |
31cee6f6 LP |
15 | |
16 | MAILING LIST: | |
17 | http://lists.freedesktop.org/mailman/listinfo/systemd-devel | |
18 | http://lists.freedesktop.org/mailman/listinfo/systemd-commits | |
19 | ||
20 | IRC: | |
21 | #systemd on irc.freenode.org | |
22 | ||
23 | BUG REPORTS: | |
24 | https://bugs.freedesktop.org/enter_bug.cgi?product=systemd | |
25 | ||
26 | AUTHOR: | |
5430f7f2 LP |
27 | Lennart Poettering |
28 | Kay Sievers | |
29 | ...and many others | |
31cee6f6 | 30 | |
673eab9b | 31 | LICENSE: |
5430f7f2 | 32 | LGPLv2.1+ for all code |
952d1536 | 33 | - except sd-readahead.[ch] which is MIT |
b67f541f LP |
34 | - except src/shared/MurmurHash2.c which is Public Domain |
35 | - except src/shared/siphash24.c which is CC0 Public Domain | |
85424725 KS |
36 | - except src/journal/lookup3.c which is Public Domain |
37 | - except src/udev/* which is (currently still) GPLv2, GPLv2+ | |
673eab9b | 38 | |
31cee6f6 | 39 | REQUIREMENTS: |
e946948e | 40 | Linux kernel >= 3.0 |
23aedd02 KS |
41 | Linux kernel >= 3.3 for loop device partition support features with nspawn |
42 | Linux kernel >= 3.8 for Smack support | |
43 | ||
44 | Kernel Config Options: | |
713bc0cf | 45 | CONFIG_DEVTMPFS |
d28315e4 | 46 | CONFIG_CGROUPS (it is OK to disable all controllers) |
713bc0cf KS |
47 | CONFIG_INOTIFY_USER |
48 | CONFIG_SIGNALFD | |
49 | CONFIG_TIMERFD | |
50 | CONFIG_EPOLL | |
41938693 | 51 | CONFIG_NET |
713bc0cf | 52 | CONFIG_SYSFS |
06d461ee | 53 | CONFIG_PROC_FS |
5d31974e | 54 | CONFIG_FHANDLE (libudev, mount and bind mount handling) |
713bc0cf KS |
55 | |
56 | Udev will fail to work with the legacy layout: | |
f28cbd03 | 57 | CONFIG_SYSFS_DEPRECATED=n |
713bc0cf KS |
58 | |
59 | Legacy hotplug slows down the system and confuses udev: | |
60 | CONFIG_UEVENT_HELPER_PATH="" | |
61 | ||
62 | Userspace firmware loading is deprecated, will go away, and | |
63 | sometimes causes problems: | |
64 | CONFIG_FW_LOADER_USER_HELPER=n | |
65 | ||
66 | Some udev rules and virtualization detection relies on it: | |
67 | CONFIG_DMIID | |
68 | ||
a5c724b2 KS |
69 | Support for some SCSI devices serial number retrieval, to |
70 | create additional symlinks in /dev/disk/ and /dev/tape: | |
71 | CONFIG_BLK_DEV_BSG | |
72 | ||
13468826 MG |
73 | Required for PrivateNetwork in service units: |
74 | CONFIG_NET_NS | |
75 | ||
713bc0cf KS |
76 | Optional but strongly recommended: |
77 | CONFIG_IPV6 | |
78 | CONFIG_AUTOFS4_FS | |
79 | CONFIG_TMPFS_POSIX_ACL | |
80 | CONFIG_TMPFS_XATTR | |
f28cbd03 | 81 | CONFIG_SECCOMP |
713bc0cf | 82 | |
06d461ee | 83 | For systemd-bootchart, several proc debug interfaces are required: |
713bc0cf KS |
84 | CONFIG_SCHEDSTATS |
85 | CONFIG_SCHED_DEBUG | |
86 | ||
f28cbd03 | 87 | For UEFI systems: |
f33016ff | 88 | CONFIG_EFIVAR_FS |
f28cbd03 KS |
89 | CONFIG_EFI_PARTITION |
90 | ||
77b6e194 LP |
91 | Note that kernel auditing is broken when used with systemd's |
92 | container code. When using systemd in conjunction with | |
19aadacf | 93 | containers, please make sure to either turn off auditing at |
77b6e194 LP |
94 | runtime using the kernel command line option "audit=0", or |
95 | turn it off at kernel compile time using: | |
96 | CONFIG_AUDIT=n | |
a7b1c397 LP |
97 | If systemd is compiled with libseccomp support on |
98 | architectures which do not use socketcall() and where seccomp | |
99 | is supported (this effectively means x86-64 and ARM, but | |
70a44afe | 100 | excludes 32-bit x86!), then nspawn will now install a |
a7b1c397 LP |
101 | work-around seccomp filter that makes containers boot even |
102 | with audit being enabled. This works correctly only on kernels | |
103 | 3.14 and newer though. TL;DR: turn audit off, still. | |
77b6e194 | 104 | |
ff70c61b | 105 | glibc >= 2.14 |
3ede835a | 106 | libcap |
c0467cf3 | 107 | libseccomp >= 1.0.0 (optional) |
e3043162 | 108 | libblkid >= 2.20 (from util-linux) (optional) |
a18535d9 | 109 | libkmod >= 15 (optional) |
3ede835a LP |
110 | PAM >= 1.1.2 (optional) |
111 | libcryptsetup (optional) | |
112 | libaudit (optional) | |
19d5d4cb | 113 | libacl (optional) |
fb0951b0 | 114 | libattr (optional) |
3ede835a | 115 | libselinux (optional) |
19d5d4cb | 116 | liblzma (optional) |
7b17a7d7 LP |
117 | libgcrypt (optional) |
118 | libqrencode (optional) | |
119 | libmicrohttpd (optional) | |
2cc86f09 ZJS |
120 | libpython (optional) |
121 | make, gcc, and similar tools | |
122 | ||
19aadacf JE |
123 | During runtime, you need the following additional |
124 | dependencies: | |
2cc86f09 | 125 | |
8be12848 ZJS |
126 | util-linux >= v2.19 (requires fsck -l, agetty -s), |
127 | v2.21 required for tests in test/ | |
df41776d | 128 | dbus >= 1.4.0 (strictly speaking optional, but recommended) |
8be12848 ZJS |
129 | sulogin (from util-linux >= 2.22 or sysvinit-tools, optional but recommended, |
130 | required for tests in test/) | |
2cc86f09 | 131 | dracut (optional) |
46ba8aae | 132 | PolicyKit (optional) |
3ede835a | 133 | |
19aadacf JE |
134 | When building from git, you need the following additional |
135 | dependencies: | |
3ede835a | 136 | |
3ede835a LP |
137 | docbook-xsl |
138 | xsltproc | |
139 | automake | |
140 | autoconf | |
141 | libtool | |
19d5d4cb | 142 | intltool |
b62cfcea | 143 | gperf |
19d5d4cb ZJS |
144 | gtkdocize (optional) |
145 | python (optional) | |
32dcef3a | 146 | python-lxml (optional, but required to build the indices) |
9015fa64 | 147 | sphinx (optional) |
21bc923a | 148 | |
19aadacf JE |
149 | When systemd-hostnamed is used, it is strongly recommended to |
150 | install nss-myhostname to ensure that, in a world of | |
151 | dynamically changing hostnames, the hostname stays resolvable | |
fff2e5b5 | 152 | under all circumstances. In fact, systemd-hostnamed will warn |
bf9e477c | 153 | if nss-myhostname is not installed. |
fff2e5b5 | 154 | |
9015fa64 ZJS |
155 | To build HTML documentation for python-systemd using sphinx, |
156 | please first install systemd (using 'make install'), and then | |
157 | invoke sphinx-build with 'make sphinx-<target>', with <target> | |
158 | being 'html' or 'latexpdf'. If using DESTDIR for installation, | |
159 | pass the same DESTDIR to 'make sphinx-html' invocation. | |
160 | ||
a24c64f0 | 161 | USERS AND GROUPS: |
37495eed LP |
162 | Default udev rules use the following standard system group |
163 | names, which need to be resolvable by getgrnam() at any time, | |
164 | even in the very early boot stages, where no other databases | |
165 | and network are available: | |
166 | ||
167 | tty, dialout, kmem, video, audio, lp, floppy, cdrom, tape, disk | |
37c0e8f3 | 168 | |
19aadacf | 169 | During runtime, the journal daemon requires the |
1a9ce3f7 | 170 | "systemd-journal" system group to exist. New journal files will |
19aadacf | 171 | be readable by this group (but not writable), which may be used |
a24c64f0 LP |
172 | to grant specific users read access. |
173 | ||
174 | It is also recommended to grant read access to all journal | |
175 | files to the system groups "wheel" and "adm" with a command | |
176 | like the following in the post installation script of the | |
177 | package: | |
178 | ||
179 | # setfacl -nm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/ | |
180 | ||
37495eed | 181 | The journal gateway daemon requires the |
1a9ce3f7 | 182 | "systemd-journal-gateway" system user and group to |
37495eed LP |
183 | exist. During execution this network facing service will drop |
184 | privileges and assume this uid/gid for security reasons. | |
185 | ||
a349eb10 LP |
186 | The NTP daemon requires the "systemd-timesync" system user and |
187 | group to exist. During execution this network facing service | |
f1721625 | 188 | will drop privileges (with the exception of CAP_SYS_TIME) and |
a349eb10 LP |
189 | assume this uid/gid for security reasons. |
190 | ||
e15007bc LP |
191 | The network management daemon requires the "systemd-network" |
192 | system user and group to exist. During execution this network | |
193 | facing service will drop privileges (with the exception of | |
194 | CAP_NET_*) and assumed this uid/gid for security reasons. | |
195 | ||
682265d5 TG |
196 | The name resolution daemon requires the "systemd-resolve" |
197 | system user and group to exist. During execution this network | |
198 | facing service will drop privileges and assume this uid/gid | |
199 | for security reasons. | |
200 | ||
21bc923a LP |
201 | WARNINGS: |
202 | systemd will warn you during boot if /etc/mtab is not a | |
203 | symlink to /proc/mounts. Please ensure that /etc/mtab is a | |
204 | proper symlink. | |
205 | ||
206 | systemd will warn you during boot if /usr is on a different | |
207 | file system than /. While in systemd itself very little will | |
19aadacf | 208 | break if /usr is on a separate partition, many of its |
21bc923a | 209 | dependencies very likely will break sooner or later in one |
19aadacf | 210 | form or another. For example, udev rules tend to refer to |
21bc923a LP |
211 | binaries in /usr, binaries that link to libraries in /usr or |
212 | binaries that refer to data files in /usr. Since these | |
19aadacf | 213 | breakages are not always directly visible, systemd will warn |
21bc923a LP |
214 | about this, since this kind of file system setup is not really |
215 | supported anymore by the basic set of Linux OS components. | |
fc7a744c | 216 | |
47bc23c1 | 217 | systemd requires that the /run mount point exists. systemd also |
b8bde116 | 218 | requires that /var/run is a a symlink to /run. |
47bc23c1 | 219 | |
aa167132 LP |
220 | For more information on this issue consult |
221 | http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken | |
222 | ||
1b4bb4fd ZJS |
223 | To run systemd under valgrind, compile with VALGRIND defined |
224 | (e.g. ./configure CPPFLAGS='... -DVALGRIND=1'). Otherwise, | |
225 | false positives will be triggered by code which violates | |
226 | some rules but is actually safe. |