Github user ygy commented on a diff in the pull request:
https://github.com/apache/incubator-brooklyn/pull/975#discussion_r42595464
--- Diff:
software/base/src/main/java/org/apache/brooklyn/entity/machine/SetHostnameCustomizer.java
---
@@ -0,0 +1,201 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.brooklyn.entity.machine;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import org.apache.brooklyn.api.location.BasicMachineLocationCustomizer;
+import org.apache.brooklyn.api.location.MachineLocation;
+import org.apache.brooklyn.config.ConfigKey;
+import org.apache.brooklyn.core.config.ConfigKeys;
+import org.apache.brooklyn.core.effector.ssh.SshEffectorTasks;
+import
org.apache.brooklyn.core.effector.ssh.SshEffectorTasks.SshEffectorTaskFactory;
+import org.apache.brooklyn.location.ssh.SshMachineLocation;
+import org.apache.brooklyn.util.core.config.ConfigBag;
+import org.apache.brooklyn.util.core.task.DynamicTasks;
+import org.apache.brooklyn.util.core.task.system.ProcessTaskWrapper;
+import org.apache.brooklyn.util.core.text.TemplateProcessor;
+import org.apache.brooklyn.util.net.Networking;
+import org.apache.brooklyn.util.ssh.BashCommands;
+import org.apache.brooklyn.util.text.Strings;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Iterables;
+
+/**
+ * Sets the hostname on an ssh'able machine. Currently only CentOS and
RHEL are supported.
+ * <p>
+ * The customizer can be configured with a hard-coded hostname, or with a
freemarker template
+ * whose value (after substitutions) will be used for the hostname.
+ */
+public class SetHostnameCustomizer extends BasicMachineLocationCustomizer {
+
+ public static final Logger log =
LoggerFactory.getLogger(SetHostnameCustomizer.class);
+
+ public static final ConfigKey<String> FIXED_HOSTNAME =
ConfigKeys.newStringConfigKey(
+ "hostname.fixed",
+ "The statically defined hostname to be set on the machine (if
non-null)");
+
+ public static final ConfigKey<String> FIXED_DOMAIN =
ConfigKeys.newStringConfigKey(
+ "domain.fixed",
+ "The statically defined domain name to be set on the machine
(if non-null)");
+
+ // the var?? tests if it exists, passing value to
?string(if_present,if_absent)
+ // the ! provides a default value afterwards, which is never used, but
is required for parsing
+ // when the config key is not available;
+ // thus the below prefers the first private address, then the first
public address, and then
+ // substitutes dots for dashes.
+ public static final ConfigKey<String> HOSTNAME_TEMPLATE =
ConfigKeys.newStringConfigKey(
+ "hostname.templated",
+ "The hostname template, to be resolved and then set on the
machine (if non-null). "
+ +"Assumed to be in free-marker format.",
+ "ip-"
+ + "${((location.privateAddresses[0]??)?string("
+ + "location.privateAddresses[0]!'X',
location.publicAddresses[0]))"
+ + "?replace(\".\",\"-\")}"
+ + "-${location.id}");
+
+ public static final ConfigKey<String> LOCAL_HOSTNAME =
ConfigKeys.newStringConfigKey(
+ "hostname.local.hostname",
+ "Host name, as known on the local box. Config is set on the
location.");
+
+ public static final ConfigKey<String> LOCAL_IP =
ConfigKeys.newStringConfigKey(
+ "hostname.local.address",
+ "Host address, as known on the local box. Config is set on the
location.");
+
+ private final ConfigBag config;
+
+ public SetHostnameCustomizer(ConfigBag config) {
+ // TODO Any checks that they've given us sufficient configuration?
+ this.config = config;
+ }
+
+ @Override
+ public void customize(MachineLocation machine) {
+ String localHostname = setLocalHostname((SshMachineLocation)
machine);
+ machine.config().set(LOCAL_HOSTNAME, localHostname);
+
+ String localIp = execHostnameMinusI((SshMachineLocation) machine);
+ machine.config().set(LOCAL_IP, localIp);
+ }
+
+ protected String generateHostname(SshMachineLocation machine) {
+ String hostnameTemplate = config.get(HOSTNAME_TEMPLATE);
+ if (Strings.isNonBlank(hostnameTemplate)) {
+ return
TemplateProcessor.processTemplateContents(hostnameTemplate, machine,
ImmutableMap.<String, Object>of());
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Sets the machine's hostname to the value controlled by
fixed_hostname and hostname_template.
+ * If these are blank (and fixed_domain is blank), then just return
the current hostname of
+ * the machine.
+ */
+ public String setLocalHostname(SshMachineLocation machine) {
+ String hostFixed = config.get(FIXED_HOSTNAME);
+ String domainFixed = config.get(FIXED_DOMAIN);
+ String hostnameTemplate = config.get(HOSTNAME_TEMPLATE);
+
+ String hostname;
+ if (Strings.isNonBlank(hostFixed)) {
+ hostname = hostFixed;
+ } else {
+ if (Strings.isNonBlank(hostnameTemplate)) {
+ hostname = generateHostname(machine);
+ } else {
+ hostname = execHostname(machine);
+ if (Strings.isBlank(domainFixed)) {
+ return hostname;
+ }
+ }
+ }
+
+ return setLocalHostname(machine, hostname, domainFixed);
+ }
+
+ /**
+ * Sets the machine's hostname to the given value, ensuring /etc/hosts
and /etc/sysconfig/network are both
+ * correctly updated.
+ */
+ public String setLocalHostname(SshMachineLocation machine, String
hostName, String domainFixed) {
+ log.info("Setting local hostname of " + machine + " to " +
hostName
+ + (Strings.isNonBlank(domainFixed) ? ", " + domainFixed :
""));
+
+ boolean hasDomain = Strings.isNonBlank(domainFixed);
+ String fqdn = hasDomain ? hostName+"."+domainFixed : hostName;
+
+ exec(machine, true,
+ BashCommands.sudo(String.format("sed -i.bak -e
'1i127.0.0.1 %s %s' -e '/^127.0.0.1/d' /etc/hosts", fqdn, hostName)),
+ BashCommands.sudo(String.format("sed -i.bak -e
's/^HOSTNAME=.*$/HOSTNAME=%s/' /etc/sysconfig/network", fqdn)),
--- End diff --
This will fail for Debian Linux derivatives like Ubuntu.
Debian uses /etc/hostname to preserve the hostname during reboots.
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