devstack/lib/rpc_backend
Daniel P. Berrange c1dbf10562 Exit after printing error about RPC config
When finding an invalid RPC configuration, devstack prints
a suitable error in the logs

    ERROR: only one rpc backend may be enabled,
           set only one of 'rabbit', 'qpid', 'zeromq'
           via ENABLED_SERVICES.

but then just carries on running, as a result the developer
is very unlikely to ever see the original error message.
Change the 'echo' to a 'die' so that it stop immediately
making the error message clearly visible.

Change-Id: If108f314e1ad2ecc79f41cbca47d08c4024a23cd
2015-01-22 15:10:56 +00:00

383 lines
13 KiB
Bash

#!/bin/bash
#
# lib/rpc_backend
# Interface for interactig with different rpc backend
# rpc backend settings
# Dependencies:
#
# - ``functions`` file
# - ``RABBIT_{HOST|PASSWORD|USERID}`` must be defined when RabbitMQ is used
# - ``RPC_MESSAGING_PROTOCOL`` option for configuring the messaging protocol
# ``stack.sh`` calls the entry points in this order:
#
# - check_rpc_backend
# - install_rpc_backend
# - restart_rpc_backend
# - iniset_rpc_backend
# Save trace setting
XTRACE=$(set +o | grep xtrace)
set +o xtrace
RPC_MESSAGING_PROTOCOL=${RPC_MESSAGING_PROTOCOL:-0.9}
# TODO(sdague): RPC backend selection is super wonky because we treat
# messaging server as a service, which it really isn't for multi host
QPID_HOST=${QPID_HOST:-}
# Functions
# ---------
# Make sure we only have one rpc backend enabled.
# Also check the specified rpc backend is available on your platform.
function check_rpc_backend {
local c svc
local rpc_needed=1
# We rely on the fact that filenames in lib/* match the service names
# that can be passed as arguments to is_service_enabled.
# We check for a call to iniset_rpc_backend in these files, meaning
# the service needs a backend.
rpc_candidates=$(grep -rl iniset_rpc_backend $TOP_DIR/lib/ | awk -F/ '{print $NF}')
for c in ${rpc_candidates}; do
if is_service_enabled $c; then
rpc_needed=0
break
fi
done
local rpc_backend_cnt=0
for svc in qpid zeromq rabbit; do
is_service_enabled $svc &&
(( rpc_backend_cnt++ )) || true
done
if [ "$rpc_backend_cnt" -gt 1 ]; then
die $LINENO \
"Only one rpc backend may be enabled, " \
"set only one of 'rabbit', 'qpid', 'zeromq' " \
"via ENABLED_SERVICES."
elif [ "$rpc_backend_cnt" == 0 ] && [ "$rpc_needed" == 0 ]; then
die $LINENO \
"at least one rpc backend must be enabled, " \
"set one of 'rabbit', 'qpid', 'zeromq'" \
"via ENABLED_SERVICES."
fi
if is_service_enabled qpid && ! qpid_is_supported; then
die $LINENO "Qpid support is not available for this version of your distribution."
fi
}
# clean up after rpc backend - eradicate all traces so changing backends
# produces a clean switch
function cleanup_rpc_backend {
if is_service_enabled rabbit; then
# Obliterate rabbitmq-server
uninstall_package rabbitmq-server
sudo killall epmd || sudo killall -9 epmd
if is_ubuntu; then
# And the Erlang runtime too
apt_get purge -y erlang*
fi
elif is_service_enabled qpid; then
if is_fedora; then
uninstall_package qpid-cpp-server
elif is_ubuntu; then
uninstall_package qpidd
else
exit_distro_not_supported "qpid installation"
fi
elif is_service_enabled zeromq; then
if is_fedora; then
uninstall_package zeromq python-zmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
uninstall_package redis python-redis
fi
elif is_ubuntu; then
uninstall_package libzmq1 python-zmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
uninstall_package redis-server python-redis
fi
elif is_suse; then
uninstall_package libzmq1 python-pyzmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
uninstall_package redis python-redis
fi
else
exit_distro_not_supported "zeromq installation"
fi
fi
# Remove the AMQP 1.0 messaging libraries
if [ "$RPC_MESSAGING_PROTOCOL" == "AMQP1" ]; then
if is_fedora; then
uninstall_package qpid-proton-c-devel
uninstall_package python-qpid-proton
fi
# TODO(kgiusti) ubuntu cleanup
fi
}
# install rpc backend
function install_rpc_backend {
# Regardless of the broker used, if AMQP 1.0 is configured load
# the necessary messaging client libraries for oslo.messaging
if [ "$RPC_MESSAGING_PROTOCOL" == "AMQP1" ]; then
if is_fedora; then
install_package qpid-proton-c-devel
install_package python-qpid-proton
elif is_ubuntu; then
# TODO(kgiusti) The QPID AMQP 1.0 protocol libraries
# are not yet in the ubuntu repos. Enable these installs
# once they are present:
#install_package libqpid-proton2-dev
#install_package python-qpid-proton
# Also add 'uninstall' directives in cleanup_rpc_backend()!
exit_distro_not_supported "QPID AMQP 1.0 Proton libraries"
else
exit_distro_not_supported "QPID AMQP 1.0 Proton libraries"
fi
# Install pyngus client API
# TODO(kgiusti) can remove once python qpid bindings are
# available on all supported platforms _and_ pyngus is added
# to the requirements.txt file in oslo.messaging
pip_install pyngus
fi
if is_service_enabled rabbit; then
# Install rabbitmq-server
install_package rabbitmq-server
elif is_service_enabled qpid; then
if is_fedora; then
install_package qpid-cpp-server
elif is_ubuntu; then
install_package qpidd
else
exit_distro_not_supported "qpid installation"
fi
_configure_qpid
elif is_service_enabled zeromq; then
# NOTE(ewindisch): Redis is not strictly necessary
# but there is a matchmaker driver that works
# really well & out of the box for multi-node.
if is_fedora; then
install_package zeromq python-zmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
install_package redis python-redis
fi
elif is_ubuntu; then
install_package libzmq1 python-zmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
install_package redis-server python-redis
fi
elif is_suse; then
install_package libzmq1 python-pyzmq
if [ "$ZEROMQ_MATCHMAKER" == "redis" ]; then
install_package redis python-redis
fi
else
exit_distro_not_supported "zeromq installation"
fi
# Necessary directory for socket location.
sudo mkdir -p /var/run/openstack
sudo chown $STACK_USER /var/run/openstack
fi
# If using the QPID broker, install the QPID python client API
if is_service_enabled qpid || [ -n "$QPID_HOST" ]; then
install_package python-qpid
fi
}
# restart the rpc backend
function restart_rpc_backend {
if is_service_enabled rabbit; then
# Start rabbitmq-server
echo_summary "Starting RabbitMQ"
# NOTE(bnemec): Retry initial rabbitmq configuration to deal with
# the fact that sometimes it fails to start properly.
# Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1144100
local i
for i in `seq 10`; do
local rc=0
[[ $i -eq "10" ]] && die $LINENO "Failed to set rabbitmq password"
if is_fedora || is_suse; then
# service is not started by default
restart_service rabbitmq-server
fi
rabbit_setuser "$RABBIT_USERID" "$RABBIT_PASSWORD" || rc=$?
if [ $rc -ne 0 ]; then
continue
fi
# change the rabbit password since the default is "guest"
sudo rabbitmqctl change_password \
$RABBIT_USERID $RABBIT_PASSWORD || rc=$?
if [ $rc -ne 0 ]; then
continue;
fi
break
done
if is_service_enabled n-cell; then
# Add partitioned access for the child cell
if [ -z `sudo rabbitmqctl list_vhosts | grep child_cell` ]; then
sudo rabbitmqctl add_vhost child_cell
sudo rabbitmqctl set_permissions -p child_cell $RABBIT_USERID ".*" ".*" ".*"
fi
fi
elif is_service_enabled qpid; then
echo_summary "Starting qpid"
restart_service qpidd
fi
}
# iniset cofiguration
function iniset_rpc_backend {
local package=$1
local file=$2
local section=$3
if is_service_enabled zeromq; then
iniset $file $section rpc_backend "zmq"
iniset $file $section rpc_zmq_matchmaker \
oslo.messaging._drivers.matchmaker_redis.MatchMakerRedis
# Set MATCHMAKER_REDIS_HOST if running multi-node.
MATCHMAKER_REDIS_HOST=${MATCHMAKER_REDIS_HOST:-127.0.0.1}
iniset $file matchmaker_redis host $MATCHMAKER_REDIS_HOST
elif is_service_enabled qpid || [ -n "$QPID_HOST" ]; then
# For Qpid use the 'amqp' oslo.messaging transport when AMQP 1.0 is used
if [ "$RPC_MESSAGING_PROTOCOL" == "AMQP1" ]; then
iniset $file $section rpc_backend "amqp"
else
iniset $file $section rpc_backend ${package}.openstack.common.rpc.impl_qpid
fi
iniset $file $section qpid_hostname ${QPID_HOST:-$SERVICE_HOST}
if [ -n "$QPID_USERNAME" ]; then
iniset $file $section qpid_username $QPID_USERNAME
iniset $file $section qpid_password $QPID_PASSWORD
fi
elif is_service_enabled rabbit || { [ -n "$RABBIT_HOST" ] && [ -n "$RABBIT_PASSWORD" ]; }; then
iniset $file $section rpc_backend ${package}.openstack.common.rpc.impl_kombu
iniset $file $section rabbit_hosts $RABBIT_HOST
iniset $file $section rabbit_password $RABBIT_PASSWORD
iniset $file $section rabbit_userid $RABBIT_USERID
fi
}
# Check if qpid can be used on the current distro.
# qpid_is_supported
function qpid_is_supported {
if [[ -z "$DISTRO" ]]; then
GetDistro
fi
# Qpid is not in openSUSE
( ! is_suse )
}
function rabbit_setuser {
local user="$1" pass="$2" found="" out=""
out=$(sudo rabbitmqctl list_users) ||
{ echo "failed to list users" 1>&2; return 1; }
found=$(echo "$out" | awk '$1 == user { print $1 }' "user=$user")
if [ "$found" = "$user" ]; then
sudo rabbitmqctl change_password "$user" "$pass" ||
{ echo "failed changing pass for '$user'" 1>&2; return 1; }
else
sudo rabbitmqctl add_user "$user" "$pass" ||
{ echo "failed changing pass for $user"; return 1; }
fi
sudo rabbitmqctl set_permissions "$user" ".*" ".*" ".*"
}
# Set up the various configuration files used by the qpidd broker
function _configure_qpid {
# the location of the configuration files have changed since qpidd 0.14
local qpid_conf_file
if [ -e /etc/qpid/qpidd.conf ]; then
qpid_conf_file=/etc/qpid/qpidd.conf
elif [ -e /etc/qpidd.conf ]; then
qpid_conf_file=/etc/qpidd.conf
else
exit_distro_not_supported "qpidd.conf file not found!"
fi
# force the ACL file to a known location
local qpid_acl_file=/etc/qpid/qpidd.acl
if [ ! -e $qpid_acl_file ]; then
sudo mkdir -p -m 755 `dirname $qpid_acl_file`
sudo touch $qpid_acl_file
sudo chmod o+r $qpid_acl_file
fi
sudo sed -i.bak '/^acl-file=/d' $qpid_conf_file
echo "acl-file=$qpid_acl_file" | sudo tee --append $qpid_conf_file
sudo sed -i '/^auth=/d' $qpid_conf_file
if [ -z "$QPID_USERNAME" ]; then
# no QPID user configured, so disable authentication
# and access control
echo "auth=no" | sudo tee --append $qpid_conf_file
cat <<EOF | sudo tee $qpid_acl_file
acl allow all all
EOF
else
# Configure qpidd to use PLAIN authentication, and add
# QPID_USERNAME to the ACL:
echo "auth=yes" | sudo tee --append $qpid_conf_file
if [ -z "$QPID_PASSWORD" ]; then
read_password QPID_PASSWORD "ENTER A PASSWORD FOR QPID USER $QPID_USERNAME"
fi
# Create ACL to allow $QPID_USERNAME full access
cat <<EOF | sudo tee $qpid_acl_file
group admin ${QPID_USERNAME}@QPID
acl allow admin all
acl deny all all
EOF
# Add user to SASL database
if is_ubuntu; then
install_package sasl2-bin
elif is_fedora; then
install_package cyrus-sasl-lib
fi
local sasl_conf_file=/etc/sasl2/qpidd.conf
sudo sed -i.bak '/PLAIN/!s/mech_list: /mech_list: PLAIN /' $sasl_conf_file
local sasl_db=`sudo grep sasldb_path $sasl_conf_file | cut -f 2 -d ":" | tr -d [:blank:]`
if [ ! -e $sasl_db ]; then
sudo mkdir -p -m 755 `dirname $sasl_db`
fi
echo $QPID_PASSWORD | sudo saslpasswd2 -c -p -f $sasl_db -u QPID $QPID_USERNAME
sudo chmod o+r $sasl_db
fi
# If AMQP 1.0 is specified, ensure that the version of the
# broker can support AMQP 1.0 and configure the queue and
# topic address patterns used by oslo.messaging.
if [ "$RPC_MESSAGING_PROTOCOL" == "AMQP1" ]; then
QPIDD=$(type -p qpidd)
if ! $QPIDD --help | grep -q "queue-patterns"; then
exit_distro_not_supported "qpidd with AMQP 1.0 support"
fi
if ! grep -q "queue-patterns=exclusive" $qpid_conf_file; then
cat <<EOF | sudo tee --append $qpid_conf_file
queue-patterns=exclusive
queue-patterns=unicast
topic-patterns=broadcast
EOF
fi
fi
}
# Restore xtrace
$XTRACE
# Tell emacs to use shell-script-mode
## Local variables:
## mode: shell-script
## End: