Add nova database migration script for postgresql
This is based on the mysql-migrate-db.sh script but with the necessary changes for interacting with postgresql. Long-term it might be possible to refactor both the mysql and postgresql scripts into a generic script but the potential complexity in doing that makes it a lower priority than simply getting pg support for the nova_api/placement table migration done in Stein. Change-Id: I1cab3183067ab2e41663ca369509d753442e775c
This commit is contained in:
Yikun Jiang
Matt Riedemann
parent
fe134de5d1
commit
e7fe0ab862
|
|
@ -0,0 +1,255 @@
|
|||
#!/bin/bash
|
||||
|
||||
# This script will attempt to migrate your nova-api placement data to
|
||||
# a new placement database. Run it with --help for usage, and --mkconfig
|
||||
# to write a template config file to use.
|
||||
|
||||
# Defaults we can guess
|
||||
DEFAULT_MIGRATE_TABLES="allocations placement_aggregates consumers inventories projects "
|
||||
DEFAULT_MIGRATE_TABLES+="resource_classes resource_provider_aggregates resource_provider_traits "
|
||||
DEFAULT_MIGRATE_TABLES+="resource_providers traits users "
|
||||
MIGRATE_TABLES=${MIGRATE_TABLES:-$DEFAULT_MIGRATE_TABLES}
|
||||
PG_MIGRATE_TABLES=${MIGRATE_TABLES// /|}}
|
||||
PLACEMENT_DB_HOST=${PLACEMENT_DB_HOST:-localhost}
|
||||
PLACEMENT_DB=${PLACEMENT_DB:-placement}
|
||||
NOVA_API_DB_HOST=${NOVA_API_DB_HOST:-localhost}
|
||||
NOVA_API_DB=${NOVA_API_DB:-nova_api}
|
||||
TMPDIR=${TMPDIR:-/tmp}
|
||||
LAST_PSQL_ERR=${TMPDIR}/migrate-psql-db.err
|
||||
|
||||
declare -a ARGS
|
||||
declare -a OPTS
|
||||
|
||||
function getflag() {
|
||||
# Return true if --$flag is present on the command line
|
||||
# Usage: getflag help -> 0
|
||||
local flag="$1"
|
||||
for opt in ${OPTS[*]}; do
|
||||
if [ "$opt" == "--${flag}" ]; then
|
||||
return 0
|
||||
fi
|
||||
done
|
||||
return 1
|
||||
}
|
||||
|
||||
function parse_argv() {
|
||||
# Parse command line arguments into positional arguments and
|
||||
# option flags. Store each in $ARGS, $OPTS.
|
||||
# Usage: parse_argv $*
|
||||
for item in $*; do
|
||||
if echo $item | grep -q -- '^--'; then
|
||||
OPTS+=($item)
|
||||
else
|
||||
ARGS+=($item)
|
||||
fi
|
||||
done
|
||||
}
|
||||
|
||||
function db_var() {
|
||||
# Return an attribute of database config based on the symbolic
|
||||
# name
|
||||
# Usage: db_var PLACEMENT USER -> $PLACEMENT_USER
|
||||
local db="$1"
|
||||
local var="$2"
|
||||
|
||||
eval echo "\$${db}_${var}"
|
||||
}
|
||||
|
||||
function psql_command() {
|
||||
# Run a psql command with the usual connection information taken
|
||||
# from a symbolic configuration name
|
||||
# Usage: psql_command PLACEMENT [command] [args..] -> stdout
|
||||
local whichdb="$1"
|
||||
shift
|
||||
local command=psql
|
||||
if [ "$2" ]; then
|
||||
command=${1:-psql}
|
||||
shift
|
||||
fi
|
||||
local db=$(db_var $whichdb DB)
|
||||
local host=$(db_var $whichdb DB_HOST)
|
||||
local user=$(db_var $whichdb USER)
|
||||
local pass=$(db_var $whichdb PASS)
|
||||
|
||||
if [ "$command" = "psql" ]; then
|
||||
command="psql -t"
|
||||
fi
|
||||
|
||||
PGPASSWORD=$pass $command -h$host -U$user $db $* 2>$LAST_PSQL_ERR
|
||||
}
|
||||
|
||||
function check_db() {
|
||||
# Check a DB to see if it's missing, present, filled with data
|
||||
# Returns 0 if it is present with data, 1 if present but no data
|
||||
# or 2 if not present (or unable to connect)
|
||||
# Usage: check_db PLACEMENT -> 0
|
||||
local whichdb="$1"
|
||||
|
||||
local inv
|
||||
local inv_count
|
||||
local error_found
|
||||
|
||||
if ! echo "SELECT CURRENT_DATABASE()" | psql_command $whichdb >/dev/null 2>&1; then
|
||||
echo "Failed to connect to $whichdb database"
|
||||
return 2
|
||||
fi
|
||||
|
||||
inv=$(echo "SELECT COUNT(id) FROM inventories" |
|
||||
psql_command $whichdb)
|
||||
if [ $? -ne 0 ]; then
|
||||
# No DB
|
||||
return 1
|
||||
fi
|
||||
|
||||
error_found=$(cat $LAST_PSQL_ERR | grep ERROR)
|
||||
if [ $? -eq 0 ]; then
|
||||
# No schema
|
||||
return 1
|
||||
fi
|
||||
|
||||
inv_count=$(echo $inv | tail -n1)
|
||||
if [ $inv_count -gt 0 ]; then
|
||||
# Data found
|
||||
return 0
|
||||
else
|
||||
# No data found, but schema intact
|
||||
return 1
|
||||
fi
|
||||
}
|
||||
|
||||
function migrate_data() {
|
||||
# Actually migrate data from a source to destination symbolic
|
||||
# database. Returns 1 if failure, 0 otherwise.
|
||||
# Usage: migrate_data NOVA_API PLACEMENT -> 0
|
||||
local source="$1"
|
||||
local dest="$2"
|
||||
local tmpdir=$(mktemp -d migrate-db.XXXXXXXX)
|
||||
local tmpfile="${tmpdir}/from-nova.sql"
|
||||
|
||||
echo "Dumping from $source to $tmpfile"
|
||||
psql_command $source pg_dump -t $PG_MIGRATE_TABLES > $tmpfile || {
|
||||
echo 'Failed to dump source database:'
|
||||
cat $LAST_PSQL_ERR
|
||||
return 1
|
||||
}
|
||||
echo "Loading to $dest from $tmpfile"
|
||||
# There is some output when loading file, so we redirect it to /dev/null.
|
||||
psql_command $dest < $tmpfile >/dev/null || {
|
||||
echo 'Failed to load destination database:'
|
||||
cat $LAST_PSQL_ERR
|
||||
return 1
|
||||
}
|
||||
}
|
||||
|
||||
function sanity_check_env() {
|
||||
# Check that we have everything we need to examine the situation
|
||||
# and potentially do the migration. Loads values from the rcfile,
|
||||
# if present. Returns 1 if a config was not found, 2 if that
|
||||
# config is incomplete or 0 if everything is good.
|
||||
# Usage: sanity_check_env $rcfile -> 0
|
||||
|
||||
RCFILE="${1:-migrate-db.rc}"
|
||||
if [ ! -f "$RCFILE" ]; then
|
||||
echo 'Specify an RC file on the command line or create migrate-db.rc in the current directory'
|
||||
return 1
|
||||
fi
|
||||
|
||||
source $RCFILE
|
||||
|
||||
required="NOVA_API_DB NOVA_API_USER NOVA_API_PASS PLACEMENT_DB PLACEMENT_USER PLACEMENT_PASS"
|
||||
for var in $required; do
|
||||
value=$(eval echo "\$$var")
|
||||
if [ -z "$value" ]; then
|
||||
echo "A value for $var was not provided but is required"
|
||||
return 2
|
||||
fi
|
||||
done
|
||||
|
||||
}
|
||||
|
||||
function make_config() {
|
||||
# Create or update a config file with defaults we know. Either use
|
||||
# the default migrate-db.rc or the file specified on the command
|
||||
# line.
|
||||
RCFILE="${1:-migrate-db.rc}"
|
||||
if [ -f "$RCFILE" ]; then
|
||||
source $RCFILE
|
||||
fi
|
||||
|
||||
vars="NOVA_API_DB NOVA_API_USER NOVA_API_PASS NOVA_API_DB_HOST "
|
||||
vars+="PLACEMENT_DB PLACEMENT_USER PLACEMENT_PASS PLACEMENT_DB_HOST "
|
||||
vars+="MIGRATE_TABLES"
|
||||
|
||||
(for var in $vars; do
|
||||
val=$(eval echo "\$$var")
|
||||
echo "${var}=\"$val\""
|
||||
done) > $RCFILE
|
||||
|
||||
echo Wrote $(readlink -f $RCFILE)
|
||||
}
|
||||
|
||||
parse_argv $*
|
||||
|
||||
if getflag help; then
|
||||
echo "Usage: $0 [flags] [rcfile]"
|
||||
echo
|
||||
echo "Flags:"
|
||||
echo " --help: this text"
|
||||
echo " --migrate: actually do data migration"
|
||||
echo " --mkconfig: write/update config to \$rcfile"
|
||||
echo
|
||||
echo "Exit codes:"
|
||||
echo " 0: Success"
|
||||
echo " 1: Usage error"
|
||||
echo " 2: Configuration missing or incomplete"
|
||||
echo " 3: Migration already completed"
|
||||
echo " 4: No data to migrate from nova (new deployment)"
|
||||
echo " 5: Unable to connect to one or both databases"
|
||||
exit 0
|
||||
fi
|
||||
|
||||
if getflag mkconfig; then
|
||||
make_config $ARGS
|
||||
exit 0
|
||||
fi
|
||||
|
||||
#
|
||||
# Actual migration logic starts here
|
||||
#
|
||||
|
||||
# Sanity check that we have what we need or bail
|
||||
sanity_check_env $ARGS || exit $?
|
||||
|
||||
# Check the state of each database we care about
|
||||
check_db NOVA_API
|
||||
nova_present=$?
|
||||
check_db PLACEMENT
|
||||
placement_present=$?
|
||||
|
||||
# Try to come up with a good reason to refuse to migrate
|
||||
if [ $nova_present -eq 0 -a $placement_present -eq 0 ]; then
|
||||
echo "Migration has already completed. The placement database appears to have data."
|
||||
exit 3
|
||||
elif [ $nova_present -eq 1 ]; then
|
||||
echo "No data present in nova database - nothing to migrate (new deployment?)"
|
||||
exit 4
|
||||
elif [ $nova_present -eq 2 ]; then
|
||||
echo "Unable to proceed without connection to nova database"
|
||||
exit 5
|
||||
elif [ $placement_present -eq 2 ]; then
|
||||
echo "Unable to proceed without connection to placement database"
|
||||
exit 5
|
||||
fi
|
||||
|
||||
# If we get here, we expect to be able to migrate. Require them to opt into
|
||||
# actual migration before we do anything.
|
||||
|
||||
echo Nova database contains data, placement database does not. Okay to proceed with migration
|
||||
|
||||
if getflag migrate $*; then
|
||||
migrate_data NOVA_API PLACEMENT
|
||||
else
|
||||
echo "To actually migrate, run me with --migrate"
|
||||
fi
|
||||
|
||||
rm -f $LAST_PSQL_ERR
|
||||
Loading…
Reference in New Issue