data driven cookbooks
TOPICS
-
Code vs data
-
Attributes
-
Node Object
-
Ohai
-
Precedence
-
Files vs Templates
-
ERB Syntax
Code DATA
vs
-
one cookbook
dev
stage
prod
-
different envionments
-
different platforms
centos
ubuntu
bsd
Code DATA
vs
-
Create generic cookbooks which can be
shared
reused
-
save tonnes of time
Code | DATA
Recipes
templates
system defined
user defined
attributes
attribute files
recipes
environments
roles
ohai
attributes
attributes
Node Object
node1
node2
noden
node1.json
node2.json
noden.json
attr
run_list
attr
run_list
attr
run_list
Chef Server
{
"name": "ws.codespaces.io",
"normal": {
"tags": [
]
},
"automatic": {
"languages": {
"python": {
"version": "2.7.6",
"builddate": "Oct 26 2016, 20:30:19"
},
"nodejs": {
"version": "0.10.48"
},
"perl": {
"version": "5.18.2",
"archname": "x86_64-linux-gnu-thread-multi"
},
"ruby": {
"platform": "x86_64-linux",
"version": "2.3.1",
"release_date": "2016-04-26",
"target": "x86_64-pc-linux-gnu",
"target_cpu": "x86_64",
"target_vendor": "pc",
"target_os": "linux",
"host": "x86_64-pc-linux-gnu",
"host_cpu": "x86_64",
"host_os": "linux-gnu",
"host_vendor": "pc",
"bin_dir": "/opt/chefdk/embedded/bin",
"ruby_bin": "/opt/chefdk/embedded/bin/ruby",
"gems_dir": "/opt/chefdk/embedded/lib/ruby/gems/2.3.0",
"gem_bin": "/opt/chefdk/embedded/bin/gem"
},
"c": {
"gcc": {
"version": "4.8.4",
"description": "gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) "
}
}
},
"network": {
"interfaces": {
"lo": {
"mtu": "65536",
"flags": [
"LOOPBACK",
"UP",
"LOWER_UP"
],
"encapsulation": "Loopback",
"addresses": {
"127.0.0.1": {
"family": "inet",
"prefixlen": "8",
"netmask": "255.0.0.0",
"scope": "Node"
},
"::1": {
"family": "inet6",
"prefixlen": "128",
"scope": "Node",
"tags": [
]
}
},
"state": "unknown"
},
"eth0": {
"type": "eth",
"number": "0",
"mtu": "1500",
"flags": [
"BROADCAST",
"MULTICAST",
"UP",
"LOWER_UP"
],
"encapsulation": "Ethernet",
"addresses": {
"22:0B:67:D7:23:84": {
"family": "lladdr"
},
"138.197.106.113": {
"family": "inet",
"prefixlen": "20",
"netmask": "255.255.240.0",
"broadcast": "138.197.111.255",
"scope": "Global"
},
"10.17.0.7": {
"family": "inet",
"prefixlen": "16",
"netmask": "255.255.0.0",
"scope": "Global"
},
"fe80::200b:67ff:fed7:2384": {
"family": "inet6",
"prefixlen": "64",
"scope": "Link",
"tags": [
]
}
},
"state": "up",
"arp": {
"138.197.96.1": "00:00:5e:00:01:6e"
},
"routes": [
{
"destination": "default",
"family": "inet",
"via": "138.197.96.1"
},
{
"destination": "10.17.0.0/16",
"family": "inet",
"scope": "link",
"proto": "kernel",
"src": "10.17.0.7"
},
{
"destination": "138.197.96.0/20",
"family": "inet",
"scope": "link",
"proto": "kernel",
"src": "138.197.106.113"
},
{
"destination": "fe80::/64",
"family": "inet6",
"metric": "256",
"proto": "kernel"
}
]
},
"eth1": {
"type": "eth",
"number": "1",
"mtu": "1500",
"flags": [
"BROADCAST",
"MULTICAST"
],
"encapsulation": "Ethernet",
"addresses": {
"1A:2A:A2:A3:09:16": {
"family": "lladdr"
}
},
"state": "down"
},
"docker0": {
"type": "docker",
"number": "0",
"mtu": "1500",
"flags": [
"BROADCAST",
"MULTICAST",
"UP",
"LOWER_UP"
],
"encapsulation": "Ethernet",
"addresses": {
"02:42:7A:D4:95:25": {
"family": "lladdr"
},
"172.17.0.1": {
"family": "inet",
"prefixlen": "16",
"netmask": "255.255.0.0",
"scope": "Global"
},
"fe80::42:7aff:fed4:9525": {
"family": "inet6",
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"scope": "Link",
"tags": [
]
}
},
"state": "up",
"arp": {
"172.17.0.2": "02:42:ac:11:00:02"
},
"routes": [
{
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"family": "inet",
"scope": "link",
"proto": "kernel",
"src": "172.17.0.1"
},
{
"destination": "fe80::/64",
"family": "inet6",
"metric": "256",
"proto": "kernel"
}
]
},
"docker_gwbridge": {
"mtu": "1500",
"flags": [
"BROADCAST",
"MULTICAST",
"UP"
],
"encapsulation": "Ethernet",
"addresses": {
"02:42:B4:16:BD:4B": {
"family": "lladdr"
},
"172.18.0.1": {
"family": "inet",
"prefixlen": "16",
"netmask": "255.255.0.0",
"scope": "Global"
}
},
"state": "down",
"routes": [
{
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"family": "inet",
"scope": "link",
"proto": "kernel",
"src": "172.18.0.1"
}
]
},
"br-8c3ec6669e18": {
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"flags": [
"BROADCAST",
"MULTICAST",
"UP",
"LOWER_UP"
],
"encapsulation": "Ethernet",
"addresses": {
"02:42:C8:51:F8:98": {
"family": "lladdr"
},
"172.0.101.1": {
"family": "inet",
"prefixlen": "24",
"netmask": "255.255.255.0",
"scope": "Global"
},
"fe80::42:c8ff:fe51:f898": {
"family": "inet6",
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"scope": "Link",
"tags": [
]
}
},
"state": "up",
"arp": {
"172.0.101.12": "02:42:ac:00:65:0c",
"172.0.101.11": "02:42:ac:00:65:0b",
"172.0.101.10": "02:42:ac:00:65:0a",
"172.0.101.13": "02:42:ac:00:65:0d"
},
"routes": [
{
"destination": "172.0.101.0/24",
"family": "inet",
"scope": "link",
"proto": "kernel",
"src": "172.0.101.1"
},
{
"destination": "fe80::/64",
"family": "inet6",
"metric": "256",
"proto": "kernel"
}
]
},
"veth71e7a64": {
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"flags": [
"BROADCAST",
"MULTICAST",
"UP",
"LOWER_UP"
],
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"addresses": {
"6A:13:04:5D:AA:6E": {
"family": "lladdr"
},
"fe80::6813:4ff:fe5d:aa6e": {
"family": "inet6",
"prefixlen": "64",
"scope": "Link",
"tags": [
]
}
},
"state": "up",
"routes": [
{
"destination": "fe80::/64",
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"proto": "kernel"
}
]
},
"vethc311335": {
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"number": "5",
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"flags": [
"BROADCAST",
"MULTICAST",
"UP",
"LOWER_UP"
],
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},
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]
}
},
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{
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}
]
},
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"UP",
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],
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]
}
},
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{
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}
]
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],
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},
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]
}
},
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{
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}
]
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}
},
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{
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}
]
}
},
"default_interface": "eth0",
"default_gateway": "138.197.96.1"
},
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}
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},
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}
},
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"macaddress": "22:0B:67:D7:23:84",
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},
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}
}
},
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"virtualization": {
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},
"system": "docker",
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},
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"hostname": "ws",
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"dmi": {
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"etc": {
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},
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]
},
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],
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},
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],
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},
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"cpu"
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},
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"blkio"
]
},
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"mount": "/sys/fs/cgroup/memory",
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},
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"freezer"
]
},
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]
},
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},
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},
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},
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"mount": "/sys/fs/cgroup/pids",
"fs_type": "cgroup",
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"nosuid",
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]
},
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"mount": "/sys/fs/cgroup/systemd",
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"nosuid",
"nodev",
"noexec",
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]
},
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"nosuid",
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"noexec",
"relatime"
]
},
"/dev/vda1,/etc/resolv.conf": {
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"mount": "/etc/resolv.conf",
"fs_type": "ext4",
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"noatime",
"errors=remount-ro",
"data=ordered"
]
},
"/dev/vda1,/etc/hostname": {
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"mount": "/etc/hostname",
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"rw",
"noatime",
"errors=remount-ro",
"data=ordered"
]
},
"/dev/vda1,/etc/hosts": {
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"mount": "/etc/hosts",
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"rw",
"noatime",
"errors=remount-ro",
"data=ordered"
]
},
"proc,/proc/bus": {
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"nodev",
"noexec",
"relatime"
]
},
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"mount": "/proc/fs",
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"ro",
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"nodev",
"noexec",
"relatime"
]
},
"proc,/proc/irq": {
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"mount": "/proc/irq",
"fs_type": "proc",
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"ro",
"nosuid",
"nodev",
"noexec",
"relatime"
]
},
"proc,/proc/sys": {
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"ro",
"nosuid",
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"noexec",
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]
},
"proc,/proc/sysrq-trigger": {
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"noexec",
"relatime"
]
},
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"mount": "/proc/kcore",
"fs_type": "tmpfs",
"mount_options": [
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"mode=755"
]
},
"tmpfs,/proc/timer_list": {
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"mount": "/proc/timer_list",
"fs_type": "tmpfs",
"mount_options": [
"rw",
"nosuid",
"mode=755"
]
},
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"fs_type": "tmpfs",
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"rw",
"nosuid",
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]
},
"tmpfs,/proc/sched_debug": {
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"mount_options": [
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"nosuid",
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]
},
"vda,": {
"device": "vda"
},
"vda1,": {
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},
"vda15,": {
"device": "vda15"
}
}
},
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},
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]
},
"/dev/vda1": {
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"fs_type": "ext4",
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]
},
"shm": {
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"percent_used": "0%",
"mount": "/dev/shm",
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"relatime",
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]
},
"proc": {
"mount": "/proc/sysrq-trigger",
"fs_type": "proc",
"mount_options": [
"ro",
"nosuid",
"nodev",
"noexec",
"relatime"
]
},
"devpts": {
"mount": "/dev/pts",
"fs_type": "devpts",
"mount_options": [
"rw",
"nosuid",
"noexec",
"relatime",
"gid=5",
"mode=620",
"ptmxmode=666"
]
},
"sysfs": {
"mount": "/sys",
"fs_type": "sysfs",
"mount_options": [
"ro",
"nosuid",
"nodev",
"noexec",
"relatime"
]
},
"cgroup": {
"mount": "/sys/fs/cgroup/pids",
"fs_type": "cgroup",
"mount_options": [
"ro",
"nosuid",
"nodev",
"noexec",
"relatime",
"pids"
]
},
"systemd": {
"mount": "/sys/fs/cgroup/systemd",
"fs_type": "cgroup",
"mount_options": [
"ro",
"nosuid",
"nodev",
"noexec",
"relatime",
"name=systemd"
]
},
"mqueue": {
"mount": "/dev/mqueue",
"fs_type": "mqueue",
"mount_options": [
"rw",
"nosuid",
"nodev",
"noexec",
"relatime"
]
}
},
"init_package": "sh",
"command": {
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},
"packages": {
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"arch": "all"
},
"apparmor": {
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"arch": "amd64"
},
"apt": {
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},
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"arch": "amd64"
},
"apt-utils": {
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"arch": "amd64"
},
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"arch": "amd64"
},
"base-files": {
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"arch": "amd64"
},
"base-passwd": {
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"arch": "amd64"
},
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"lsb-base": {
"version": "4.1+Debian11ubuntu6.2",
"arch": "all"
},
"lsb-release": {
"version": "4.1+Debian11ubuntu6.2",
"arch": "all"
},
"make": {
"version": "3.81-8.2ubuntu3",
"arch": "amd64"
},
"makedev": {
"version": "2.3.1-93ubuntu1",
"arch": "all"
},
"manpages": {
"version": "3.54-1ubuntu1",
"arch": "all"
},
"manpages-dev": {
"version": "3.54-1ubuntu1",
"arch": "all"
},
"mawk": {
"version": "1.3.3-17ubuntu2",
"arch": "amd64"
},
"mime-support": {
"version": "3.54ubuntu1.1",
"arch": "all"
},
"module-init-tools": {
"version": "15-0ubuntu6",
"arch": "all"
},
"mount": {
"version": "2.20.1-5.1ubuntu20.9",
"arch": "amd64"
},
"mountall": {
"version": "2.53",
"arch": "amd64"
},
"multiarch-support": {
"version": "2.19-0ubuntu6.9",
"arch": "amd64"
},
"ncurses-base": {
"version": "5.9+20140118-1ubuntu1",
"arch": "all"
},
"ncurses-bin": {
"version": "5.9+20140118-1ubuntu1",
"arch": "amd64"
},
"ncurses-term": {
"version": "5.9+20140118-1ubuntu1",
"arch": "all"
},
"net-tools": {
"version": "1.60-25ubuntu2.1",
"arch": "amd64"
},
"netbase": {
"version": "5.2",
"arch": "all"
},
"netcat-openbsd": {
"version": "1.105-7ubuntu1",
"arch": "amd64"
},
"nodejs": {
"version": "0.10.48-1nodesource1~trusty1",
"arch": "amd64"
},
"ntp": {
"version": "1:4.2.6.p5+dfsg-3ubuntu2.14.04.10",
"arch": "amd64"
},
"ntpdate": {
"version": "1:4.2.6.p5+dfsg-3ubuntu2.14.04.10",
"arch": "amd64"
},
"openssh-client": {
"version": "1:6.6p1-2ubuntu2.8",
"arch": "amd64"
},
"openssh-server": {
"version": "1:6.6p1-2ubuntu2.8",
"arch": "amd64"
},
"openssh-sftp-server": {
"version": "1:6.6p1-2ubuntu2.8",
"arch": "amd64"
},
"openssl": {
"version": "1.0.1f-1ubuntu2.22",
"arch": "amd64"
},
"passwd": {
"version": "1:4.1.5.1-1ubuntu9.2",
"arch": "amd64"
},
"patch": {
"version": "2.7.1-4ubuntu2.3",
"arch": "amd64"
},
"perl": {
"version": "5.18.2-2ubuntu1.1",
"arch": "amd64"
},
"perl-base": {
"version": "5.18.2-2ubuntu1.1",
"arch": "amd64"
},
"perl-modules": {
"version": "5.18.2-2ubuntu1.1",
"arch": "all"
},
"plymouth": {
"version": "0.8.8-0ubuntu17.1",
"arch": "amd64"
},
"procps": {
"version": "1:3.3.9-1ubuntu2.2",
"arch": "amd64"
},
"python": {
"version": "2.7.5-5ubuntu3",
"arch": "amd64"
},
"python-chardet": {
"version": "2.0.1-2build2",
"arch": "all"
},
"python-minimal": {
"version": "2.7.5-5ubuntu3",
"arch": "amd64"
},
"python-requests": {
"version": "2.2.1-1ubuntu0.3",
"arch": "all"
},
"python-six": {
"version": "1.5.2-1ubuntu1",
"arch": "all"
},
"python-urllib3": {
"version": "1.7.1-1ubuntu4",
"arch": "all"
},
"python2.7": {
"version": "2.7.6-8ubuntu0.3",
"arch": "amd64"
},
"python2.7-minimal": {
"version": "2.7.6-8ubuntu0.3",
"arch": "amd64"
},
"python3": {
"version": "3.4.0-0ubuntu2",
"arch": "amd64"
},
"python3-minimal": {
"version": "3.4.0-0ubuntu2",
"arch": "amd64"
},
"python3.4": {
"version": "3.4.3-1ubuntu1~14.04.5",
"arch": "amd64"
},
"python3.4-minimal": {
"version": "3.4.3-1ubuntu1~14.04.5",
"arch": "amd64"
},
"readline-common": {
"version": "6.3-4ubuntu2",
"arch": "all"
},
"resolvconf": {
"version": "1.69ubuntu1.1",
"arch": "all"
},
"rlwrap": {
"version": "0.37-5",
"arch": "amd64"
},
"rsync": {
"version": "3.1.0-2ubuntu0.2",
"arch": "amd64"
},
"rsyslog": {
"version": "7.4.4-1ubuntu2.6",
"arch": "amd64"
},
"sed": {
"version": "4.2.2-4ubuntu1",
"arch": "amd64"
},
"sensible-utils": {
"version": "0.0.9",
"arch": "all"
},
"sqlite3": {
"version": "3.8.2-1ubuntu2.1",
"arch": "amd64"
},
"sudo": {
"version": "1.8.9p5-1ubuntu1.3",
"arch": "amd64"
},
"sysv-rc": {
"version": "2.88dsf-41ubuntu6.3",
"arch": "all"
},
"sysvinit-utils": {
"version": "2.88dsf-41ubuntu6.3",
"arch": "amd64"
},
"tar": {
"version": "1.27.1-1ubuntu0.1",
"arch": "amd64"
},
"tcpd": {
"version": "7.6.q-25",
"arch": "amd64"
},
"tree": {
"version": "1.6.0-1",
"arch": "amd64"
},
"tzdata": {
"version": "2016j-0ubuntu0.14.04",
"arch": "all"
},
"ubuntu-keyring": {
"version": "2012.05.19",
"arch": "all"
},
"ubuntu-minimal": {
"version": "1.325",
"arch": "amd64"
},
"ucf": {
"version": "3.0027+nmu1",
"arch": "all"
},
"udev": {
"version": "204-5ubuntu20.20",
"arch": "amd64"
},
"unzip": {
"version": "6.0-9ubuntu1.5",
"arch": "amd64"
},
"upstart": {
"version": "1.12.1-0ubuntu4.2",
"arch": "amd64"
},
"ureadahead": {
"version": "0.100.0-16",
"arch": "amd64"
},
"util-linux": {
"version": "2.20.1-5.1ubuntu20.9",
"arch": "amd64"
},
"vim": {
"version": "2:7.4.052-1ubuntu3.1",
"arch": "amd64"
},
"vim-common": {
"version": "2:7.4.052-1ubuntu3.1",
"arch": "amd64"
},
"vim-runtime": {
"version": "2:7.4.052-1ubuntu3.1",
"arch": "all"
},
"vim-tiny": {
"version": "2:7.4.052-1ubuntu3.1",
"arch": "amd64"
},
"wget": {
"version": "1.15-1ubuntu1.14.04.2",
"arch": "amd64"
},
"whiptail": {
"version": "0.52.15-2ubuntu5",
"arch": "amd64"
},
"xauth": {
"version": "1:1.0.7-1ubuntu1",
"arch": "amd64"
},
"xkb-data": {
"version": "2.10.1-1ubuntu1",
"arch": "all"
},
"xz-utils": {
"version": "5.1.1alpha+20120614-2ubuntu2",
"arch": "amd64"
},
"zlib1g": {
"version": "1:1.2.8.dfsg-1ubuntu1",
"arch": "amd64"
}
},
"time": {
"timezone": "UTC"
},
"root_group": "root",
"keys": {
"ssh": {
"host_rsa_public": "AAAAB3NzaC1yc2EAAAADAQABAAABAQDR8yajG4rlZ0BZyynXNcsISwvhsjlPSopvG9RfY5PRG6SOsTUnijXG/qUIUNq1po4JgtiI/zq/GGGN2snWWUiDKYPglzn5b8u5NxoPgDPMuiFNylWogP2iK3clB3HEf/BXAoO+dpHhZ4t97bftSATMJ6L9Ur+uejscwcScMUTDqhOnSNy8TzwsFSPcIxRQg+1sTrrMpTKgH4mP532Qz6BUIZr6SljmCzwsgSf7129Lq3bsT8JfE4m9AdBDEAg/OMJMDeMvaz7m8TwOA99gtCexdSPbA5WXZBDsE5c4C15ZgvZJMjwVWga6CEwRS95H3qHd/kNXbsaNt0f45xEz3aW5",
"host_dsa_public": "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",
"host_ecdsa_public": "AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBNSatcmevDaBtYFAMRTm8d8inXSD2hgRAxt9SnclH2LZCFBaZZvA9bX1yKkheor5ftRtWDs5W7RjqhVXQeqvJWo=",
"host_ecdsa_type": "ecdsa-sha2-nistp256",
"host_ed25519_public": "AAAAC3NzaC1lZDI1NTE5AAAAIBtP9YK9fascW5riKBL2iWxOeL1OZPWh6r4xCoS9dX6a"
}
},
"recipes": [
],
"expanded_run_list": [
],
"roles": [
]
}
}SAMPLE
NODE
OBJECT
ohai
-
System Profiler
-
Installed with chef-client
system defined
attributes
- Platform
- Network
- Kernel
- Memory
- CPU
- Virtualization
- Disk Mounts
- Other system info
ohai
ohai
ohai ipaddress
ohai hostname
ohai memory
ohai memory/total
ohai cpu/0/model_namesystem defined
attributes
Finding Information on the Node with ohai
Node Object
node1
node1.json
attr
run_list
Chef Server
> knife
ohai
knife node show app1
knife node show app1 -l
knife node show app1 -a ipaddress
knife node show app1 -a ipaddress memory.total
knife node show app1 -a ipaddress memory.total
system defined
attributes
Finding Node Information from Workstation
referencing
ATTRIBUTES
ohai
ohai ipaddress
ohai hostname
ohai memory
ohai memory/total
ohai cpu/model_namenode['ipaddress']
node['hostname'] node['memory']['total']
node['cpu']['model_name']
attributes
system defined
user defined
attributes
attribute files
recipes
environments
roles
user defined attributes
Attribute strategies
Attribute Files
Sane Defaults
Recipes
Roles
Env
Override Values
port = 80
user = tomcat
attribute file
['tomcat']['user']
'tomcat'
=
default
attribute
value
precedence
user
defined
attributes
ACCESSING
Attributes
node['tomcat']['user']
node['ipaddress']
node['memory']['total']
Recipes
Templates
user
defined
attributes
system defined
template node['tomcat']['config'] do
source 'tomcat.conf.erb'
owner node['tomcat']['user']
group node['tomcat']['group']
mode '0644'
action :create
notifies :restart, "service[#{node['tomcat']['service']}]", :delayed
endExample
Using attribute in a Recipe
demo
group exercise
Parameterizing Tomcat Configs
group exercise
file: cookbooks/tomcat/attributes/default.rb
default['tomcat']['user'] = 'tomcat'
default['tomcat']['group'] = 'tomcat'
default['tomcat']['config'] = '/etc/tomcat/tomcat.conf'
default['tomcat']['packages'] = [ 'tomcat', 'tomcat-webapps' ]
default['tomcat']['service'] = 'tomcat'define attributes
cd myapp
chef generate attribute cookbooks/tomcat defaultgroup exercise
file: cookbooks/tomcat/attributes/default.rb
default['tomcat']['user'] = 'tomcat'
default['tomcat']['group'] = 'tomcat'
default['tomcat']['config'] = '/etc/tomcat/tomcat.conf'
default['tomcat']['user_config'] = '/etc/tomcat/tomcat-users.xml'
default['tomcat']['packages'] = [ 'tomcat', 'tomcat-webapps' ]
default['tomcat']['service'] = 'tomcat'define attributes
cd myapp
chef generate attribute cookbooks/tomcat defaulttomcat::config
cookbook_file node['tomcat']['config'] do
source 'tomcat.conf'
owner node['tomcat']['user']
group node['tomcat']['group']
mode '0644'
action :create
notifies :restart, "service[#{node['tomcat']['service']}]", :delayed
endrefactor recipes
package [ 'epel-release' ]
package node['tomcat']['packages']
service node['tomcat']['service'] do
action [ :start, :enable]
endtomcat::install
tomcat::service
apply
group exercise
handle platform specific configs
lets convert base.rb recipe into a cookbook which can be applied to all linux nodes to perform common tasks.....
chef generate cookbook cookbooks/basecp /workspace/chapter3/base.rb cookbooks/base/recipes/default.rbGenerate base cookbook
Copy over existing recipe
group exercise
knife node run_list add app1 "recipe[base]"knife cookbook upload base
[on node1]
sudo chef-clientAdd recipe to run list
Upload and apply
group exercise
knife node run_list add app1 "recipe[base]"sudo chef-clientAdd default recipe from base to run list
Apply
note: change this
Failes because service "ntp" is not available on centos. It was created for ubuntu.
NTP
ubuntu
centos
package
service
ntp
ntp
ntp
ntpd
group exercise
create attribute file for base cookbook
group exercise
chef generate attribute cookbooks/base defaultcase node['platform_family']
when 'rhel'
default['ntp']['service'] = 'ntpd'
else
default['ntp']['service'] = 'ntp'
end
Attribute
file: cookbooks/base/attributes/default.rb
service node['ntp']['service'] do
action [ :start, :enable ]
endRecipe
file: cookbooks/base/recipes/default.rb
group exercise
knife cookbook upload base
[On node1]
sudo chef-clientUpload cookbook and apply
templates
server.dev.xml
server.stg.xml
server.prod.xml
memory = 128mb
port = 8081
memory = 4gb
port = 8888
memory = 16gb
port = 8080
COOKBOOK_FILE
dev
stage
prod
server.xml.erb
memory = <%= @memory %>
port = <%= @port %>
template
env
role
cookbook
server.xml
ERB
ERB = EMbedded ruby
Erubis
-
Contains text with dynamic ruby code
-
uses tags to mark dynamic code
ERB Tags
<%=
%>
<%
%>
group exercise
templatize motd
chef generate template cookbooks/base motdThis server is a property of <%= node['org']['name'] %>
SYSTEM INFO:
HOSTNAME : <%= node['hostname'] %>
IP ADDRESS : <%= node['ipaddress'] %>
MEMORY : <%= node['memory']['total'] %>default['org']['name'] = "XYZ Inc."file: cookbooks/base/templates/default/motd.erb
file: cookbooks/base/attributes/default.rb
group exercise
template '/etc/motd' do
source 'motd.erb'
owner 'root'
group 'root'
mode 0644
endfile: cookbooks/base/recipes/default.rb
APPLY
group exercise
Replace file resource with template to manage /etc/motd
| default | |
|---|---|
| role | 4 |
| environment | 3 |
| recipe | 2 |
| attribute files | 1 |
attributes Precedence chart
example
dev
stage
prod
attrib file
env
8080
8081
8081
8080
8080
port =
8080
8081
8000
role
8000
recipe
['tomcat']['user']
'tomcat'
=
default
attribute
value
precedence
node.
user
defined
attributes
Lets define org name from recipes.
node.default['org']['name'] = "School of Devops"
file: cookbooks/base/recipes/default.rb
APPLY
group exercise
Templatize Tomcat Configs
LAB
- tomcat.conf
Steps
- Copy over existing configs to templates/*.erb
- Parameterize configs by adding template variables and defining properties in attribute files
summary