X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/d91427ea861db0bac30f08eec9137d5346e7137b..6136f8f024129e31ddd067233e24cbd8638c2dbc:/lib/constants.py

diff --git a/lib/constants.py b/lib/constants.py
index 23dacdc..e5233b0 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -21,10 +21,12 @@
 
 """Module holding different constants."""
 
+import re
+
 from ganeti import _autoconf
 
 # various versions
-PROTOCOL_VERSION = 20
+PROTOCOL_VERSION = 30
 RELEASE_VERSION = _autoconf.PACKAGE_VERSION
 OS_API_V10 = 10
 OS_API_V15 = 15
@@ -99,21 +101,27 @@ SSL_CERT_FILE = DATA_DIR + "/server.pem"
 RAPI_CERT_FILE = DATA_DIR + "/rapi.pem"
 HMAC_CLUSTER_KEY = DATA_DIR + "/hmac.key"
 WATCHER_STATEFILE = DATA_DIR + "/watcher.data"
+WATCHER_PAUSEFILE = DATA_DIR + "/watcher.pause"
 INSTANCE_UPFILE = RUN_GANETI_DIR + "/instance-status"
 SSH_KNOWN_HOSTS_FILE = DATA_DIR + "/known_hosts"
 RAPI_USERS_FILE = DATA_DIR + "/rapi_users"
 QUEUE_DIR = DATA_DIR + "/queue"
+DAEMON_UTIL = _autoconf.PKGLIBDIR + "/daemon-util"
 ETC_HOSTS = "/etc/hosts"
 DEFAULT_FILE_STORAGE_DIR = _autoconf.FILE_STORAGE_DIR
+ENABLE_FILE_STORAGE = _autoconf.ENABLE_FILE_STORAGE
 SYSCONFDIR = _autoconf.SYSCONFDIR
+TOOLSDIR = _autoconf.TOOLSDIR
+CONF_DIR = SYSCONFDIR + "/ganeti"
 
 MASTER_SOCKET = SOCKET_DIR + "/ganeti-master"
 
-NODE_INITD_SCRIPT = _autoconf.SYSCONFDIR + "/init.d/ganeti"
-
 NODED = "ganeti-noded"
+CONFD = "ganeti-confd"
 RAPI = "ganeti-rapi"
 MASTERD = "ganeti-masterd"
+# used in the ganeti-nbma project
+NLD = "ganeti-nld"
 
 MULTITHREADED_DAEMONS = frozenset([MASTERD])
 
@@ -126,10 +134,16 @@ DAEMONS_SSL = {
 DAEMONS_PORTS = {
   # daemon-name: ("proto", "default-port")
   NODED: ("tcp", 1811),
+  CONFD: ("udp", 1814),
   RAPI: ("tcp", 5080),
+  # used in the ganeti-nbma project
+  NLD: ("udp", 1816),
 }
 DEFAULT_NODED_PORT = DAEMONS_PORTS[NODED][1]
+DEFAULT_CONFD_PORT = DAEMONS_PORTS[CONFD][1]
 DEFAULT_RAPI_PORT = DAEMONS_PORTS[RAPI][1]
+# used in the ganeti-nbma project
+DEFAULT_NLD_PORT = DAEMONS_PORTS[NLD][1]
 
 FIRST_DRBD_PORT = 11000
 LAST_DRBD_PORT = 14999
@@ -137,27 +151,39 @@ MASTER_SCRIPT = "ganeti-master"
 
 LOG_DIR = _autoconf.LOCALSTATEDIR + "/log/ganeti/"
 DAEMONS_LOGFILES = {
- # "daemon-name": "logfile"
- NODED: LOG_DIR + "node-daemon.log",
- RAPI: LOG_DIR + "rapi-daemon.log",
- MASTERD: LOG_DIR + "master-daemon.log",
-}
+  # "daemon-name": "logfile"
+  NODED: LOG_DIR + "node-daemon.log",
+  CONFD: LOG_DIR + "conf-daemon.log",
+  RAPI: LOG_DIR + "rapi-daemon.log",
+  MASTERD: LOG_DIR + "master-daemon.log",
+  # used in the ganeti-nbma project
+  NLD: LOG_DIR + "nl-daemon.log",
+  }
 LOG_OS_DIR = LOG_DIR + "os"
 LOG_WATCHER = LOG_DIR + "watcher.log"
 LOG_COMMANDS = LOG_DIR + "commands.log"
 LOG_BURNIN = LOG_DIR + "burnin.log"
 
+# one of 'no', 'yes', 'only'
+SYSLOG_USAGE = _autoconf.SYSLOG_USAGE
+SYSLOG_NO = "no"
+SYSLOG_YES = "yes"
+SYSLOG_ONLY = "only"
+SYSLOG_SOCKET = "/dev/log"
+
 OS_SEARCH_PATH = _autoconf.OS_SEARCH_PATH
 EXPORT_DIR = _autoconf.EXPORT_DIR
 
 EXPORT_CONF_FILE = "config.ini"
 
+XEN_BOOTLOADER = _autoconf.XEN_BOOTLOADER
 XEN_KERNEL = _autoconf.XEN_KERNEL
 XEN_INITRD = _autoconf.XEN_INITRD
 
 KVM_PATH = _autoconf.KVM_PATH
 SOCAT_PATH = _autoconf.SOCAT_PATH
-KVM_MIGRATION_PORT = _autoconf.KVM_MIGRATION_PORT
+SOCAT_USE_ESCAPE = _autoconf.SOCAT_USE_ESCAPE
+SOCAT_ESCAPE_CODE = "0x1d"
 
 VALUE_DEFAULT = "default"
 VALUE_AUTO = "auto"
@@ -166,11 +192,15 @@ VALUE_NONE = "none"
 VALUE_TRUE = "true"
 VALUE_FALSE = "false"
 
+# External script validation mask
+EXT_PLUGIN_MASK = re.compile("^[a-zA-Z0-9_-]+$")
+
 # hooks-related constants
-HOOKS_BASE_DIR = _autoconf.SYSCONFDIR + "/ganeti/hooks"
+HOOKS_BASE_DIR = CONF_DIR + "/hooks"
 HOOKS_PHASE_PRE = "pre"
 HOOKS_PHASE_POST = "post"
 HOOKS_NAME_CFGUPDATE = "config-update"
+HOOKS_NAME_WATCHER = "watcher"
 HOOKS_VERSION = 2
 
 # hooks subject type (what object type does the LU deal with)
@@ -188,19 +218,39 @@ ST_LVM_PV = "lvm-pv"
 ST_LVM_VG = "lvm-vg"
 
 # Storage fields
+# first two are valid in LU context only, not passed to backend
+SF_NODE = "node"
+SF_TYPE = "type"
+# and the rest are valid in backend
 SF_NAME = "name"
 SF_SIZE = "size"
 SF_FREE = "free"
 SF_USED = "used"
 SF_ALLOCATABLE = "allocatable"
 
+# Storage operations
+SO_FIX_CONSISTENCY = "fix-consistency"
+
 # Available fields per storage type
-VALID_STORAGE_FIELDS = {
-  ST_FILE: frozenset([SF_NAME, SF_USED, SF_FREE]),
-  ST_LVM_PV: frozenset([SF_NAME, SF_SIZE, SF_USED, SF_FREE, SF_ALLOCATABLE]),
-  ST_LVM_VG: frozenset([SF_NAME, SF_SIZE]),
+VALID_STORAGE_FIELDS = frozenset([SF_NAME, SF_TYPE, SF_SIZE,
+                                  SF_USED, SF_FREE, SF_ALLOCATABLE])
+
+VALID_STORAGE_TYPES = frozenset([ST_FILE, ST_LVM_PV, ST_LVM_VG])
+
+MODIFIABLE_STORAGE_FIELDS = {
+  ST_LVM_PV: frozenset([SF_ALLOCATABLE]),
+  }
+
+VALID_STORAGE_OPERATIONS = {
+  ST_LVM_VG: frozenset([SO_FIX_CONSISTENCY]),
   }
 
+# Local disk status
+# Note: Code depends on LDS_OKAY < LDS_UNKNOWN < LDS_FAULTY
+(LDS_OKAY,
+ LDS_UNKNOWN,
+ LDS_FAULTY) = range(1, 4)
+
 # disk template types
 DT_DISKLESS = "diskless"
 DT_PLAIN = "plain"
@@ -222,6 +272,7 @@ LDS_BLOCK = frozenset([LD_LV, LD_DRBD8])
 # drbd constants
 DRBD_HMAC_ALG = "md5"
 DRBD_NET_PROTOCOL = "C"
+DRBD_BARRIERS = _autoconf.DRBD_BARRIERS
 
 # file backend driver
 FD_LOOP = "loop"
@@ -239,6 +290,7 @@ DISK_ACCESS_SET = frozenset([DISK_RDONLY, DISK_RDWR])
 REPLACE_DISK_PRI = "replace_on_primary"    # replace disks on primary
 REPLACE_DISK_SEC = "replace_on_secondary"  # replace disks on secondary
 REPLACE_DISK_CHG = "replace_new_secondary" # change secondary node
+REPLACE_DISK_AUTO = "replace_auto"
 
 # lock recalculate mode
 LOCKS_REPLACE = 'replace'
@@ -269,6 +321,7 @@ EXIT_NOTCLUSTER = 5
 EXIT_NOTMASTER = 11
 EXIT_NODESETUP_ERROR = 12
 EXIT_CONFIRMATION = 13 # need user confirmation
+EXIT_NOTCANDIDATE = 14
 
 # tags
 TAG_CLUSTER = "cluster"
@@ -288,6 +341,16 @@ BIND_ADDRESS_GLOBAL = "0.0.0.0"
 MIN_VG_SIZE = 20480
 DEFAULT_MAC_PREFIX = "aa:00:00"
 LVM_STRIPECOUNT = _autoconf.LVM_STRIPECOUNT
+# default maximum instance wait time, in seconds.
+DEFAULT_SHUTDOWN_TIMEOUT = 120
+NODE_MAX_CLOCK_SKEW = 150
+
+# runparts results
+(RUNPARTS_SKIP,
+ RUNPARTS_RUN,
+ RUNPARTS_ERR) = range(3)
+
+RUNPARTS_STATUS = frozenset([RUNPARTS_SKIP, RUNPARTS_RUN, RUNPARTS_ERR])
 
 # RPC constants
 (RPC_ENCODING_NONE,
@@ -301,12 +364,14 @@ OS_SCRIPT_RENAME = 'rename'
 OS_SCRIPTS = frozenset([OS_SCRIPT_CREATE, OS_SCRIPT_IMPORT,
                         OS_SCRIPT_EXPORT, OS_SCRIPT_RENAME])
 
+OS_API_FILE = 'ganeti_api_version'
+OS_VARIANTS_FILE = 'variants.list'
+
 # ssh constants
-SSH_INITD_SCRIPT = _autoconf.SSH_INITD_SCRIPT
-SSH_CONFIG_DIR = "/etc/ssh/"
-SSH_HOST_DSA_PRIV = SSH_CONFIG_DIR + "ssh_host_dsa_key"
+SSH_CONFIG_DIR = _autoconf.SSH_CONFIG_DIR
+SSH_HOST_DSA_PRIV = SSH_CONFIG_DIR + "/ssh_host_dsa_key"
 SSH_HOST_DSA_PUB = SSH_HOST_DSA_PRIV + ".pub"
-SSH_HOST_RSA_PRIV = SSH_CONFIG_DIR + "ssh_host_rsa_key"
+SSH_HOST_RSA_PRIV = SSH_CONFIG_DIR + "/ssh_host_rsa_key"
 SSH_HOST_RSA_PUB = SSH_HOST_RSA_PRIV + ".pub"
 SSH = "ssh"
 SCP = "scp"
@@ -337,11 +402,15 @@ HV_CDROM_IMAGE_PATH = "cdrom_image_path"
 HV_NIC_TYPE = "nic_type"
 HV_DISK_TYPE = "disk_type"
 HV_VNC_BIND_ADDRESS = "vnc_bind_address"
+HV_VNC_PASSWORD_FILE = "vnc_password_file"
 HV_VNC_TLS = "vnc_tls"
 HV_VNC_X509 = "vnc_x509_path"
 HV_VNC_X509_VERIFY = "vnc_x509_verify"
 HV_ACPI = "acpi"
 HV_PAE = "pae"
+HV_USE_BOOTLOADER = "use_bootloader"
+HV_BOOTLOADER_ARGS = "bootloader_args"
+HV_BOOTLOADER_PATH = "bootloader_path"
 HV_KERNEL_ARGS = "kernel_args"
 HV_KERNEL_PATH = "kernel_path"
 HV_INITRD_PATH = "initrd_path"
@@ -350,18 +419,25 @@ HV_SERIAL_CONSOLE = "serial_console"
 HV_USB_MOUSE = "usb_mouse"
 HV_DEVICE_MODEL = "device_model"
 HV_INIT_SCRIPT = "init_script"
+HV_MIGRATION_PORT = "migration_port"
+HV_USE_LOCALTIME = "use_localtime"
+HV_DISK_CACHE = "disk_cache"
 
 HVS_PARAMETER_TYPES = {
   HV_BOOT_ORDER: VTYPE_STRING,
   HV_CDROM_IMAGE_PATH: VTYPE_STRING,
   HV_NIC_TYPE: VTYPE_STRING,
   HV_DISK_TYPE: VTYPE_STRING,
+  HV_VNC_PASSWORD_FILE: VTYPE_STRING,
   HV_VNC_BIND_ADDRESS: VTYPE_STRING,
   HV_VNC_TLS: VTYPE_BOOL,
   HV_VNC_X509: VTYPE_STRING,
   HV_VNC_X509_VERIFY: VTYPE_BOOL,
   HV_ACPI: VTYPE_BOOL,
   HV_PAE: VTYPE_BOOL,
+  HV_USE_BOOTLOADER: VTYPE_BOOL,
+  HV_BOOTLOADER_PATH: VTYPE_STRING,
+  HV_BOOTLOADER_ARGS: VTYPE_STRING,
   HV_KERNEL_PATH: VTYPE_STRING,
   HV_KERNEL_ARGS: VTYPE_STRING,
   HV_INITRD_PATH: VTYPE_STRING,
@@ -370,6 +446,9 @@ HVS_PARAMETER_TYPES = {
   HV_USB_MOUSE: VTYPE_STRING,
   HV_DEVICE_MODEL: VTYPE_STRING,
   HV_INIT_SCRIPT: VTYPE_STRING,
+  HV_MIGRATION_PORT: VTYPE_INT,
+  HV_USE_LOCALTIME: VTYPE_BOOL,
+  HV_DISK_CACHE: VTYPE_STRING,
   }
 
 HVS_PARAMETERS = frozenset(HVS_PARAMETER_TYPES.keys())
@@ -415,7 +494,7 @@ HYPER_TYPES = frozenset([HT_XEN_PVM, HT_FAKE, HT_XEN_HVM, HT_KVM, HT_CHROOT])
 HTS_REQ_PORT = frozenset([HT_XEN_HVM, HT_KVM])
 
 VNC_BASE_PORT = 5900
-VNC_PASSWORD_FILE = _autoconf.SYSCONFDIR + "/ganeti/vnc-cluster-password"
+VNC_PASSWORD_FILE = CONF_DIR + "/vnc-cluster-password"
 VNC_DEFAULT_BIND_ADDRESS = '0.0.0.0'
 
 # NIC types
@@ -444,6 +523,15 @@ HT_DISK_SD = "sd"
 HT_DISK_MTD = "mtd"
 HT_DISK_PFLASH = "pflash"
 
+HT_CACHE_DEFAULT = "default"
+HT_CACHE_NONE = "none"
+HT_CACHE_WTHROUGH = "writethrough"
+HT_CACHE_WBACK = "writeback"
+HT_VALID_CACHE_TYPES = frozenset([HT_CACHE_DEFAULT,
+                                  HT_CACHE_NONE,
+                                  HT_CACHE_WTHROUGH,
+                                  HT_CACHE_WBACK])
+
 HT_HVM_VALID_DISK_TYPES = frozenset([HT_DISK_PARAVIRTUAL, HT_DISK_IOEMU])
 HT_KVM_VALID_DISK_TYPES = frozenset([HT_DISK_PARAVIRTUAL, HT_DISK_IDE,
                                      HT_DISK_SCSI, HT_DISK_SD, HT_DISK_MTD,
@@ -471,12 +559,15 @@ NV_FILELIST = "filelist"
 NV_HVINFO = "hvinfo"
 NV_HYPERVISOR = "hypervisor"
 NV_INSTANCELIST = "instancelist"
-NV_LVLIST = "lvlist"
 NV_NODELIST = "nodelist"
 NV_NODENETTEST = "node-net-test"
 NV_VERSION = "version"
 NV_VGLIST = "vglist"
+NV_LVLIST = "lvlist"
+NV_PVLIST = "pvlist"
 NV_DRBDLIST = "drbd-list"
+NV_NODESETUP = "nodesetup"
+NV_TIME = "time"
 
 # Allocator framework constants
 IALLOCATOR_VERSION = 2
@@ -484,6 +575,7 @@ IALLOCATOR_DIR_IN = "in"
 IALLOCATOR_DIR_OUT = "out"
 IALLOCATOR_MODE_ALLOC = "allocate"
 IALLOCATOR_MODE_RELOC = "relocate"
+IALLOCATOR_MODE_MEVAC = "multi-evacuate"
 IALLOCATOR_SEARCH_PATH = _autoconf.IALLOCATOR_SEARCH_PATH
 
 # Job queue
@@ -537,10 +629,13 @@ SS_CLUSTER_NAME = "cluster_name"
 SS_CLUSTER_TAGS = "cluster_tags"
 SS_FILE_STORAGE_DIR = "file_storage_dir"
 SS_MASTER_CANDIDATES = "master_candidates"
+SS_MASTER_CANDIDATES_IPS = "master_candidates_ips"
 SS_MASTER_IP = "master_ip"
 SS_MASTER_NETDEV = "master_netdev"
 SS_MASTER_NODE = "master_node"
 SS_NODE_LIST = "node_list"
+SS_NODE_PRIMARY_IPS = "node_primary_ips"
+SS_NODE_SECONDARY_IPS = "node_secondary_ips"
 SS_OFFLINE_NODES = "offline_nodes"
 SS_ONLINE_NODES = "online_nodes"
 SS_INSTANCE_LIST = "instance_list"
@@ -551,10 +646,14 @@ DEFAULT_ENABLED_HYPERVISOR = HT_XEN_PVM
 
 HVC_DEFAULTS = {
   HT_XEN_PVM: {
+    HV_USE_BOOTLOADER: False,
+    HV_BOOTLOADER_PATH: XEN_BOOTLOADER,
+    HV_BOOTLOADER_ARGS: '',
     HV_KERNEL_PATH: "/boot/vmlinuz-2.6-xenU",
     HV_INITRD_PATH: '',
     HV_ROOT_PATH: '/dev/sda1',
     HV_KERNEL_ARGS: 'ro',
+    HV_MIGRATION_PORT: 8002,
     },
   HT_XEN_HVM: {
     HV_BOOT_ORDER: "cd",
@@ -562,10 +661,13 @@ HVC_DEFAULTS = {
     HV_NIC_TYPE: HT_NIC_RTL8139,
     HV_DISK_TYPE: HT_DISK_PARAVIRTUAL,
     HV_VNC_BIND_ADDRESS: '0.0.0.0',
+    HV_VNC_PASSWORD_FILE: VNC_PASSWORD_FILE,
     HV_ACPI: True,
     HV_PAE: True,
     HV_KERNEL_PATH: "/usr/lib/xen/boot/hvmloader",
     HV_DEVICE_MODEL: "/usr/lib/xen/bin/qemu-dm",
+    HV_MIGRATION_PORT: 8002,
+    HV_USE_LOCALTIME: False,
     },
   HT_KVM: {
     HV_KERNEL_PATH: "/boot/vmlinuz-2.6-kvmU",
@@ -578,11 +680,15 @@ HVC_DEFAULTS = {
     HV_VNC_TLS: False,
     HV_VNC_X509: '',
     HV_VNC_X509_VERIFY: False,
+    HV_VNC_PASSWORD_FILE: '',
     HV_CDROM_IMAGE_PATH: '',
     HV_BOOT_ORDER: HT_BO_DISK,
     HV_NIC_TYPE: HT_NIC_PARAVIRTUAL,
     HV_DISK_TYPE: HT_DISK_PARAVIRTUAL,
     HV_USB_MOUSE: '',
+    HV_MIGRATION_PORT: 8102,
+    HV_USE_LOCALTIME: False,
+    HV_DISK_CACHE: HT_CACHE_DEFAULT,
     },
   HT_FAKE: {
     },
@@ -591,6 +697,10 @@ HVC_DEFAULTS = {
     },
   }
 
+HVC_GLOBALS = frozenset([
+  HV_MIGRATION_PORT,
+  ])
+
 BEC_DEFAULTS = {
   BE_MEMORY: 128,
   BE_VCPUS: 1,
@@ -603,3 +713,94 @@ NICC_DEFAULTS = {
   }
 
 MASTER_POOL_SIZE_DEFAULT = 10
+
+CONFD_PROTOCOL_VERSION = 1
+
+CONFD_REQ_PING = 0
+CONFD_REQ_NODE_ROLE_BYNAME = 1
+CONFD_REQ_NODE_PIP_BY_INSTANCE_IP = 2
+CONFD_REQ_CLUSTER_MASTER = 3
+CONFD_REQ_NODE_PIP_LIST = 4
+CONFD_REQ_MC_PIP_LIST = 5
+CONFD_REQ_INSTANCES_IPS_LIST = 6
+
+# Confd request query fields. These are used to narrow down queries.
+# These must be strings rather than integers, because json-encoding
+# converts them to strings anyway, as they're used as dict-keys.
+CONFD_REQQ_LINK = "0"
+CONFD_REQQ_IP = "1"
+CONFD_REQQ_IPLIST = "2"
+CONFD_REQQ_FIELDS = "3"
+
+CONFD_REQFIELD_NAME = "0"
+CONFD_REQFIELD_IP = "1"
+CONFD_REQFIELD_MNODE_PIP = "2"
+
+CONFD_REQS = frozenset([
+  CONFD_REQ_PING,
+  CONFD_REQ_NODE_ROLE_BYNAME,
+  CONFD_REQ_NODE_PIP_BY_INSTANCE_IP,
+  CONFD_REQ_CLUSTER_MASTER,
+  CONFD_REQ_NODE_PIP_LIST,
+  CONFD_REQ_MC_PIP_LIST,
+  CONFD_REQ_INSTANCES_IPS_LIST,
+  ])
+
+CONFD_REPL_STATUS_OK = 0
+CONFD_REPL_STATUS_ERROR = 1
+CONFD_REPL_STATUS_NOTIMPLEMENTED = 2
+
+CONFD_REPL_STATUSES = frozenset([
+  CONFD_REPL_STATUS_OK,
+  CONFD_REPL_STATUS_ERROR,
+  CONFD_REPL_STATUS_NOTIMPLEMENTED,
+  ])
+
+(CONFD_NODE_ROLE_MASTER,
+ CONFD_NODE_ROLE_CANDIDATE,
+ CONFD_NODE_ROLE_OFFLINE,
+ CONFD_NODE_ROLE_DRAINED,
+ CONFD_NODE_ROLE_REGULAR,
+ ) = range(5)
+
+# A few common errors for confd
+CONFD_ERROR_UNKNOWN_ENTRY = 1
+CONFD_ERROR_INTERNAL = 2
+CONFD_ERROR_ARGUMENT = 3
+
+# Each request is "salted" by the current timestamp.
+# This constants decides how many seconds of skew to accept.
+# TODO: make this a default and allow the value to be more configurable
+CONFD_MAX_CLOCK_SKEW = 2 * NODE_MAX_CLOCK_SKEW
+
+# When we haven't reloaded the config for more than this amount of seconds, we
+# force a test to see if inotify is betraying us.
+CONFD_CONFIG_RELOAD_TIMEOUT = 60
+
+# If we receive more than one update in this amount of seconds, we move to
+# polling every RATELIMIT seconds, rather than relying on inotify, to be able
+# to serve more requests.
+CONFD_CONFIG_RELOAD_RATELIMIT = 2
+
+# Magic number prepended to all confd queries.
+# This allows us to distinguish different types of confd protocols and handle
+# them. For example by changing this we can move the whole payload to be
+# compressed, or move away from json.
+CONFD_MAGIC_FOURCC = 'plj0'
+
+# By default a confd request is sent to the minimum between this number and all
+# MCs. 6 was chosen because even in the case of a disastrous 50% response rate,
+# we should have enough answers to be able to compare more than one.
+CONFD_DEFAULT_REQ_COVERAGE = 6
+
+# Timeout in seconds to expire pending query request in the confd client
+# library. We don't actually expect any answer more than 10 seconds after we
+# sent a request.
+CONFD_CLIENT_EXPIRE_TIMEOUT = 10
+
+# Maximum UDP datagram size.
+# On IPv4: 64K - 20 (ip header size) - 8 (udp header size) = 65507
+# On IPv6: 64K - 40 (ip6 header size) - 8 (udp header size) = 65487
+#   (assuming we can't use jumbo frames)
+# We just set this to 60K, which should be enough
+MAX_UDP_DATA_SIZE = 61440