diff --git a/src/Pure/Tools/phabricator.scala b/src/Pure/Tools/phabricator.scala
--- a/src/Pure/Tools/phabricator.scala
+++ b/src/Pure/Tools/phabricator.scala
@@ -1,402 +1,405 @@
 /*  Title:      Pure/Tools/phabricator.scala
     Author:     Makarius
 
 Support for Phabricator server. See also:
   - https://www.phacility.com/phabricator
   - https://secure.phabricator.com/book/phabricator
 */
 
 package isabelle
 
 
 import scala.util.matching.Regex
 
 
 object Phabricator
 {
   /** defaults **/
 
   /* required packages */
 
   val packages: List[String] =
     Build_Docker.packages :::
     List(
       // https://secure.phabricator.com/source/phabricator/browse/master/scripts/install/install_ubuntu.sh 15e6e2adea61
       "git", "mysql-server", "apache2", "libapache2-mod-php", "php", "php-mysql",
       "php-gd", "php-curl", "php-apcu", "php-cli", "php-json", "php-mbstring",
       // more packages
       "php-zip", "python-pygments", "ssh")
 
 
   /* global system resources */
 
   val daemon_user = "phabricator"
 
   val ssh_standard = 22
   val ssh_alternative1 = 222
   val ssh_alternative2 = 2222
 
 
   /* installation parameters */
 
   val default_name = "vcs"
 
-  def default_prefix(name: String): String = "phabricator-" + name
+  def phabricator_name(name: String = "", ext: String = ""): String =
+    "phabricator" + (if (name.isEmpty) "" else "-" + name) + (if (ext.isEmpty) "" else "." + ext)
+
+  def isabelle_phabricator_name(name: String = "", ext: String = ""): String =
+    "isabelle-" + phabricator_name(name = name, ext = ext)
 
   def default_root(options: Options, name: String): Path =
-    Path.explode(options.string("phabricator_www_root")) + Path.basic(default_prefix(name))
+    Path.explode(options.string("phabricator_www_root")) +
+    Path.basic(phabricator_name(name = name))
 
   def default_repo(options: Options, name: String): Path =
     default_root(options, name) + Path.basic("repo")
 
 
 
   /** global configuration **/
 
-  val global_config = Path.explode("/etc/isabelle-phabricator.conf")
+  val global_config = Path.explode("/etc/" + isabelle_phabricator_name(ext = "conf"))
 
   sealed case class Config(name: String, root: Path)
   {
-    def home: Path = root + Path.explode("phabricator")
+    def home: Path = root + Path.explode(phabricator_name())
 
     def execute(command: String): Process_Result =
       Isabelle_System.bash("./bin/" + command, cwd = home.file).check
   }
 
   def read_config(): List[Config] =
   {
     if (global_config.is_file) {
       for (entry <- Library.trim_split_lines(File.read(global_config)) if entry.nonEmpty)
       yield {
         space_explode(':', entry) match {
           case List(name, root) => Config(name, Path.explode(root))
           case _ => error("Malformed config file " + global_config + "\nentry " + quote(entry))
         }
       }
     }
     else Nil
   }
 
   def write_config(configs: List[Config])
   {
     File.write(global_config,
       configs.map(config => config.name + ":" + config.root.implode).mkString("", "\n", "\n"))
   }
 
   def get_config(name: String): Config =
     read_config().find(config => config.name == name) getOrElse
       error("Bad Isabelle/Phabricator installation " + quote(name))
 
 
 
   /** setup **/
 
   def user_setup(name: String, description: String, ssh_setup: Boolean = false)
   {
     if (!Linux.user_exists(name)) {
       Linux.user_add(name, description = description, ssh_setup = ssh_setup)
     }
     else if (Linux.user_description(name) != description) {
       error("User " + quote(name) + " already exists --" +
         " for Phabricator it should have the description:\n  " + quote(description))
     }
   }
 
   def phabricator_setup(
     options: Options,
     name: String = default_name,
-    prefix: String = "",
     root: String = "",
     repo: String = "",
     package_update: Boolean = false,
     progress: Progress = No_Progress)
   {
     /* system environment */
 
     Linux.check_system_root()
 
     if (package_update) {
       Linux.package_update(progress = progress)
       Linux.check_reboot_required()
     }
 
     Linux.package_install(packages, progress = progress)
     Linux.check_reboot_required()
 
 
     /* users */
 
     if (name == daemon_user) {
       error("Clash of installation name with daemon user " + quote(daemon_user))
     }
 
     user_setup(daemon_user, "Phabricator Daemon User", ssh_setup = true)
     user_setup(name, "Phabricator SSH User")
 
     val www_user = options.string("phabricator_www_user")
 
 
     /* basic installation */
 
-    val prefix_name = proper_string(prefix) getOrElse default_prefix(name)
     val root_path = if (root.nonEmpty) Path.explode(root) else default_root(options, name)
     val repo_path = if (repo.nonEmpty) Path.explode(repo) else default_repo(options, name)
 
     val configs = read_config()
 
     for (config <- configs if config.name == name) {
       error("Duplicate Phabricator installation " + quote(name) + " in " + config.root)
     }
 
     if (!Isabelle_System.bash("mkdir -p " + File.bash_path(root_path)).ok) {
       error("Failed to create root directory " + root_path)
     }
 
     progress.bash(cwd = root_path.file, echo = true,
       script = """
         set -e
         chown """ + Bash.string(www_user) + ":" + Bash.string(www_user) + """ .
         chmod 755 .
 
         git clone https://github.com/phacility/libphutil.git
         git clone https://github.com/phacility/arcanist.git
         git clone https://github.com/phacility/phabricator.git
       """).check
 
     val config = Config(name, root_path)
     write_config(configs ::: List(config))
 
     config.execute("config set pygments.enabled true")
 
 
     /* local repository directory */
 
     if (!Isabelle_System.bash("mkdir -p " + File.bash_path(repo_path)).ok) {
       error("Failed to create local repository directory " + repo_path)
     }
 
     Isabelle_System.bash(cwd = repo_path.file,
       script = """
         set -e
         chown -R """ + Bash.string(daemon_user) + ":" + Bash.string(daemon_user) + """ .
         chmod 755 .
       """).check
 
     config.execute("config set repository.default-local-path " + File.bash_path(repo_path))
 
 
     /* MySQL setup */
 
     progress.echo("MySQL setup...")
 
-    File.write(Path.explode("/etc/mysql/mysql.conf.d/phabricator.cnf"),
+    File.write(Path.explode("/etc/mysql/mysql.conf.d/" + isabelle_phabricator_name(ext = "cnf")),
 """[mysqld]
 max_allowed_packet = 32M
 innodb_buffer_pool_size = 1600M
 local_infile = 0
 """)
 
     Linux.service_restart("mysql")
 
 
     def mysql_conf(R: Regex): Option[String] =
       split_lines(File.read(Path.explode(options.string("phabricator_mysql_config")))).
         collectFirst({ case R(a) => a })
 
     for (user <- mysql_conf("""^user\s*=\s*(\S*)\s*$""".r)) {
       config.execute("config set mysql.user " + Bash.string(user))
     }
 
     for (pass <- mysql_conf("""^password\s*=\s*(\S*)\s*$""".r)) {
       config.execute("config set mysql.pass " + Bash.string(pass))
     }
 
     config.execute("config set storage.default-namespace " +
-      Bash.string(prefix_name.replace("-", "_")))
+      Bash.string(phabricator_name(name = name).replace("-", "_")))
 
     config.execute("config set storage.mysql-engine.max-size 8388608")
 
     config.execute("storage upgrade --force")
 
 
     /* PHP daemon */
 
     progress.echo("PHP daemon setup...")
 
     config.execute("config set phd.user " + Bash.string(daemon_user))
 
-    Linux.service_install("phd-" + prefix_name,
+    Linux.service_install(isabelle_phabricator_name(),
 """[Unit]
-Description=PHP daemon (Phabricator """ + quote(name) + """)
+Description=PHP daemon for Isabelle/Phabricator """ + quote(name) + """
 After=syslog.target network.target apache2.service mysql.service
 
 [Service]
 Type=oneshot
 User=""" + daemon_user + """
 Group=""" + daemon_user + """
 Environment=PATH=/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin
-ExecStart=""" + root_path.expand.implode + """/phabricator/bin/phd start
-ExecStop=""" + root_path.expand.implode + """/phabricator/bin/phd stop
+ExecStart=""" + config.home.implode + """/bin/phd start
+ExecStop=""" + config.home.implode + """/bin/phd stop
 RemainAfterExit=yes
 
 [Install]
 WantedBy=multi-user.target
 """)
 
 
     /* SSH hosting */
 
     progress.echo("SSH hosting setup...")
 
     val ssh_port = ssh_alternative2
 
     config.execute("config set diffusion.ssh-user " + Bash.string(name))
     config.execute("config set diffusion.ssh-port " + ssh_port)
 
-    val sudoers_file = Path.explode("/etc/sudoers.d") + Path.basic(prefix_name)
+    val sudoers_file = Path.explode("/etc/sudoers.d") + Path.basic(isabelle_phabricator_name())
     File.write(sudoers_file,
       www_user + " ALL=(" + daemon_user + ") SETENV: NOPASSWD: /usr/bin/git, /usr/bin/hg, /usr/bin/ssh, /usr/bin/id\n" +
       name + " ALL=(" + daemon_user + ") SETENV: NOPASSWD: /usr/bin/git, /usr/bin/git-upload-pack, /usr/bin/git-receive-pack, /usr/bin/hg, /usr/bin/svnserve, /usr/bin/ssh, /usr/bin/id\n")
 
     Isabelle_System.bash("chmod 0440 " + File.bash_path(sudoers_file)).check
 
 
     /* PHP setup */
 
     val php_version =
       Isabelle_System.bash("""php --run 'echo PHP_MAJOR_VERSION . "." . PHP_MINOR_VERSION;'""")
         .check.out
 
     val php_conf =
       Path.explode("/etc/php") + Path.basic(php_version) +  // educated guess
-        Path.explode("apache2/conf.d/phabricator.ini")
+        Path.explode("apache2/conf.d") +
+        Path.basic(isabelle_phabricator_name(ext = "ini"))
 
     File.write(php_conf,
       "post_max_size = 32M\n" +
       "opcache.validate_timestamps = 0\n" +
       "memory_limit = 512M\n")
 
 
     /* Apache setup */
 
     progress.echo("Apache setup...")
 
     val apache_root = Path.explode(options.string("phabricator_apache_root"))
     val apache_sites = apache_root + Path.explode("sites-available")
 
     if (!apache_sites.is_dir) error("Bad Apache sites directory " + apache_sites)
 
-    File.write(apache_sites + Path.basic(prefix_name + ".conf"),
+    val server_name = phabricator_name(ext = "lvh.me")  // alias for "localhost" for testing
+    val server_url = "http://" + server_name
+
+    File.write(apache_sites + Path.basic(isabelle_phabricator_name(ext = "conf")),
 """<VirtualHost *:80>
-    #ServerName: "lvh.me" is an alias for "localhost" for testing
-    ServerName """ + prefix_name + """.lvh.me
+    ServerName """ + server_name + """
     ServerAdmin webmaster@localhost
     DocumentRoot """ + config.home.implode + """/webroot
 
     ErrorLog ${APACHE_LOG_DIR}/error.log
     RewriteEngine on
     RewriteRule ^(.*)$  /index.php?__path__=$1  [B,L,QSA]
 </VirtualHost>
 
 # vim: syntax=apache ts=4 sw=4 sts=4 sr noet
 """)
 
     Isabelle_System.bash( """
       set -e
       a2enmod rewrite
-      a2ensite """ + Bash.string(prefix_name)).check
+      a2ensite """ + Bash.string(isabelle_phabricator_name())).check
 
     Linux.service_restart("apache2")
 
-    progress.echo("\nDONE\nWeb configuration via http://" + prefix_name + ".lvh.me")
+    progress.echo("\nDONE\nWeb configuration via " + server_url)
   }
 
 
   /* Isabelle tool wrapper */
 
   val isabelle_tool1 =
     Isabelle_Tool("phabricator_setup", "setup Phabricator server on Ubuntu Linux", args =>
     {
       var repo = ""
       var package_update = false
       var options = Options.init()
-      var prefix = ""
       var root = ""
 
       val getopts =
         Getopts("""
 Usage: isabelle phabricator_setup [OPTIONS] [NAME]
 
   Options are:
     -R DIR       repository directory (default: """ + default_repo(options, "NAME") + """)
     -U           full update of system packages before installation
     -o OPTION    override Isabelle system OPTION (via NAME=VAL or NAME)
-    -p PREFIX    prefix for derived names (default: """ + default_prefix("NAME") + """)
     -r DIR       installation root directory (default: """ + default_root(options, "NAME") + """)
 
   Install Phabricator as Ubuntu LAMP application (Linux, Apache, MySQL, PHP).
 
   Slogan: "Discuss. Plan. Code. Review. Test.
   Every application your project needs, all in one tool."
 
   The installation NAME (default: """ + quote(default_name) + """) is mapped to
   a regular Unix user and used for public SSH access.
 """,
           "R:" -> (arg => repo = arg),
           "U" -> (_ => package_update = true),
           "o:" -> (arg => options = options + arg),
-          "p:" -> (arg => prefix = arg),
           "r:" -> (arg => root = arg))
 
       val more_args = getopts(args)
 
       val name =
         more_args match {
           case Nil => default_name
           case List(name) => name
           case _ => getopts.usage()
         }
 
       val progress = new Console_Progress
 
-      phabricator_setup(options, name, prefix = prefix, root = root, repo = repo,
+      phabricator_setup(options, name, root = root, repo = repo,
         package_update = package_update, progress = progress)
     })
 
 
 
   /** update **/
 
   def phabricator_update(name: String, progress: Progress = No_Progress)
   {
     Linux.check_system_root()
 
     ???
   }
 
 
   /* Isabelle tool wrapper */
 
   val isabelle_tool2 =
     Isabelle_Tool("phabricator_update", "update Phabricator server installation", args =>
     {
       val getopts =
         Getopts("""
 Usage: isabelle phabricator_update [NAME]
 
   Update Phabricator installation, with lookup of NAME (default + """ + quote(default_name) + """)
   in """ + global_config + "\n")
 
       val more_args = getopts(args)
       val name =
         more_args match {
           case Nil => default_name
           case List(name) => name
           case _ => getopts.usage()
         }
 
       val progress = new Console_Progress
 
       phabricator_update(name, progress = progress)
     })
 }