def _create_lb_haproxy_cfg(self, msg,
base_cfg_path='/etc/haproxy/haproxy.cfg'):
try:
haproxy_new_proxy_cfg = self._create_haproxy_listen_cfg(
msg, base_cfg_path)
except exception.HaproxyLBExists as e:
LOG.warn('%s', e)
raise exception.HaproxyCreateCfgError(explanation=str(e))
new_cfg_path = '/etc/haproxy/haproxy.cfg.new'
cmd = 'cp %s %s' % (base_cfg_path, new_cfg_path)
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error("Failed to copy original configuration: %s", e)
raise exception.HaproxyCreateCfgError(explanation=str(e))
try:
with open(new_cfg_path, 'a') as cfile:
cfile.write(haproxy_new_proxy_cfg)
except IOError as e:
LOG.error("Failed to open %s: %s" % (new_cfg_path, e))
raise exception.HaproxyCreateCfgError(explanation=str(e))
return new_cfg_path
def _test_haproxy_config(self, cfile_path):
LOG.info('Testing the new haproxy configuration file')
cmd = "haproxy -c -f %s" % cfile_path
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.warn('Did not pass the new haproxy configuration test: %s', e)
raise
def _replace_original_cfg_with_new(self, new_cfg_path):
cmd = "cp %s /etc/haproxy/haproxy.cfg" % new_cfg_path
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error("Failed to replace the orignal configuration")
return -1, str(e)
return 0, None
def binding_ip(self, ips):
dev = FLAGS.worker.service_interface
for ip in ips:
if ip in self.ips:
continue
if FLAGS.worker.service_interface == 'lo':
cmd = 'ip addr add %s/32 scope link dev %s' % (ip, dev)
else:
cmd = 'ip addr add %s/32 scope global dev %s' % (ip, dev)
utils.execute(cmd)
def _backup_original_cfg(self):
now = datetime.datetime.now().strftime("%Y-%m-%d-%H-%M-%S-%f")
backup_filename = 'haproxy.cfg_' + now
backup_path = os.path.join(self.cfg_backup_dir, backup_filename)
cmd = "cp /etc/haproxy/haproxy.cfg %s" % backup_path
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error("Failed to make a backup configuration")
return -1, str(e)
return 0, backup_path
def init_host(self):
"""Handle initialization if this is a standalone service.
Child class should override this method
"""
dev = FLAGS.worker.service_interface
cmd = 'ip addr show dev %s' % dev
out = utils.execute(cmd)
for line in out.split('\n'):
fields = line.split()
if fields and fields[0] == 'inet':
self.ips.append(fields[1].split('/')[0])
def _reload_haproxy_cfg(self, backup_path):
LOG.debug("Reloading haproxy")
try:
pid = self._get_haproxy_pid()
except IOError:
return -1
except ValueError:
return -1
cmd = ("haproxy -f /etc/haproxy/haproxy.cfg -p "
"/var/run/haproxy.pid -sf %s " % pid)
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error("Failed to reload haproxy(pid=%s): %s", pid, e)
LOG.debug('Try to rollback the configuration')
cmd = "cp %s /etc/haproxy/haproxy.cfg" % backup_path
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error('Failed to rollback the configuration')
return -1
LOG.debug('Try to load the original configration')
cmd = ("haproxy -f /etc/haproxy/haproxy.cfg -p "
"/var/run/haproxy.pid -sf %s " % pid)
try:
utils.execute(cmd)
except exception.ProcessExecutionError as e:
LOG.error('Failed to load original configuration')
return -1
LOG.debug("Reloaded haproxy successfully")
return 0
