diff --git a/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/core/Utils.kt b/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/core/Utils.kt
index f807a28..ad38bdf 100644
--- a/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/core/Utils.kt
+++ b/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/core/Utils.kt
@@ -52,7 +52,15 @@ fun String.escapeBacktick(): String = replace("`", "\\`")
 fun String.escapeDollar(): String = replace("$", "\\$")
 fun String.escapeSingleQuoteForShell(): String = replace("'", "'\"'\"'")
 fun String.escapeProcentForPrintf(): String = replace("%", "%%")
-fun String.endingWithFileSeparator(): String = if (length > 0 && (last() != fileSeparatorChar())) this + fileSeparator() else this
+fun String.endingWithFileSeparator(): String = if (isNotEmpty() && (last() != fileSeparatorChar())) this + fileSeparator() else this
+
+
+// --------------  Functions for system related properties    -----------------
+fun fileSeparator(): String = File.separator
+fun fileSeparatorChar(): Char = File.separatorChar
+fun newline(): String = System.getProperty("line.separator")
+fun hostUserHome(): String = System.getProperty("user.home") + fileSeparator()
+
 
 /**
  * Put String between double quotes and escapes chars that need to be escaped (by backslash) for use in Unix Shell String
@@ -82,12 +90,19 @@ internal fun echoCommandForTextWithNewlinesReplaced(text: String): String {
 }
 
 
-fun fileSeparator(): String = File.separator
-fun fileSeparatorChar(): Char = File.separatorChar
-fun newline(): String = System.getProperty("line.separator")
-fun hostUserHome(): String = System.getProperty("user.home") + fileSeparator()
+/**
+ * Returns content of a local file as String (from the filesystem on the machine where provs has been initiated)
+ */
+internal fun getLocalFileContent(fullyQualifiedLocalFileName: String, sudo: Boolean = false): String {
+    val content = local().fileContent(fullyQualifiedLocalFileName, sudo)
+    check(content != null, { "Could not retrieve content from file: $fullyQualifiedLocalFileName" })
+    return content
+}
 
 
+/**
+ * Returns content of a resource file as String
+ */
 fun getResourceAsText(path: String): String {
     val resource = Thread.currentThread().contextClassLoader.getResource(path)
     requireNotNull(resource) { "Resource $path not found" }
@@ -95,13 +110,55 @@ fun getResourceAsText(path: String): String {
 }
 
 
-internal fun getLocalFileContent(fullyQualifiedLocalFileName: String, sudo: Boolean = false): String {
-    val content = local().fileContent(fullyQualifiedLocalFileName, sudo)
-    check(content != null, { "Could not retrieve content from file: $fullyQualifiedLocalFileName" })
-    return content
+/**
+ * Returns content of a resource file as String with the variables resolved
+ */
+fun getResourceResolved(path: String, values: Map<String, String>): String {
+    val resource = Thread.currentThread().contextClassLoader.getResource(path)
+    requireNotNull(resource) { "Resource $path not found" }
+    return resource.readText().resolve(values)
 }
 
 
+/**
+ * Returns a String in which placeholders (e.g. $var or ${var}) are replaced by the specified values.
+ * This function can be used for resolving templates at RUNTIME (e.g. for templates read from files) as
+ * for compile time this functionality is already provided by the compiler out-of-the-box, of course.
+ * For a usage example see the corresponding test.
+ */
+fun String.resolve(
+    values: Map<String, String>
+): String {
+    var text = this
+
+    // replace all simple variable patterns (i.e. without curly braces)
+    val matcherSimple = Regex("\\$([a-zA-Z_][a-zA-Z_0-9]*)")
+    var match = matcherSimple.find(text)
+    while (match != null) {
+        val variableName = match.groupValues.get(1)
+        val newText = values.get(variableName)
+        require(newText != null, { "No value found for: " + variableName })
+        text = text.replace("\$$variableName", newText)
+        match = matcherSimple.find(text)
+    }
+
+    // replace all variables within curly braces
+    val matcherWithBraces = Regex("\\$\\{([a-zA-Z_][a-zA-Z_0-9]*)}")
+    match = matcherWithBraces.find(text)
+    while (match != null) {
+        val variableName = match.groupValues.get(1)
+        val newText = values.get(variableName)
+        require(newText != null, { "No value found for: " + variableName })
+        text = text.replace("\${$variableName}", newText)
+        match = matcherWithBraces.find(text)
+    }
+
+    // replace escaped dollars
+    text = text.replace("\${'$'}", "\$")
+
+    return text
+}
+
 /**
  * Returns default local Prov instance.
  */
@@ -126,7 +183,7 @@ fun remote(host: String, remoteUser: String, password: Secret? = null, platform:
 
 
 /**
- * Returns Prov instance which eexcutes its tasks in a local docker container with name containerName.
+ * Returns Prov instance which executes its tasks in a local docker container with name containerName.
  * If a container with the given name is running already, it'll be reused if parameter useExistingContainer is set to true.
  * If a container is reused, it is not checked if it has the correct, specified image.
  * Determines automatically if sudo is required if sudo is null, otherwise the specified sudo is used
diff --git a/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/Filesystem.kt b/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/Filesystem.kt
index d4f1de3..31a76b7 100644
--- a/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/Filesystem.kt
+++ b/src/main/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/Filesystem.kt
@@ -6,11 +6,17 @@ import org.domaindrivenarchitecture.provs.framework.core.getLocalFileContent
 import java.io.File
 
 
+/**
+ * Returns true if the given file exists.
+ */
 fun Prov.fileExists(file: String, sudo: Boolean = false): Boolean {
     return cmdNoEval((if (sudo) "sudo " else "") + "test -e " + file).success
 }
 
 
+/**
+ * Creates a file with its content retrieved from a local resource file
+ */
 fun Prov.createFileFromResource(
     fullyQualifiedFilename: String,
     resourceFilename: String,
@@ -27,6 +33,26 @@ fun Prov.createFileFromResource(
 }
 
 
+/**
+ * Creates a file with its content retrieved of a local resource file in which placeholders are substituted with the specified values.
+ */
+fun Prov.createFileFromResourceTemplate(
+    fullyQualifiedFilename: String,
+    resourceFilename: String,
+    resourcePath: String = "",
+    values: Map<String, String>,
+    posixFilePermission: String? = null,
+    sudo: Boolean = false
+): ProvResult = def {
+    createFile(
+        fullyQualifiedFilename,
+        getResourceAsText(resourcePath.endingWithFileSeparator() + resourceFilename).resolve(values),
+        posixFilePermission,
+        sudo
+    )
+}
+
+
 /**
  * Copies a file from the local environment to the running Prov instance.
  * In case the running ProvInstance is also local, it would copy from local to local.
@@ -46,6 +72,9 @@ fun Prov.copyFileFromLocal(
 }
 
 
+/**
+ * Creates a file with the specified data. If text is null, an empty file is created
+ */
 fun Prov.createFile(
     fullyQualifiedFilename: String,
     text: String?,
@@ -96,7 +125,7 @@ fun Prov.deleteFile(file: String, path: String? = null, sudo: Boolean = false):
 
 
 fun Prov.fileContainsText(file: String, content: String, sudo: Boolean = false): Boolean {
-    return cmdNoEval((if (sudo) "sudo " else "") + "grep '${content.escapeSingleQuote()}' $file").success
+    return cmdNoEval((if (sudo) "sudo " else "") + "grep -- '${content.escapeSingleQuote()}' $file").success
 }
 
 
diff --git a/src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/network.kt b/src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/network.kt
index 5e6a32b..6cdb57b 100644
--- a/src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/network.kt
+++ b/src/main/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/network.kt
@@ -2,7 +2,7 @@ package org.domaindrivenarchitecture.provs.server.infrastructure
 
 import org.domaindrivenarchitecture.provs.framework.core.Prov
 import org.domaindrivenarchitecture.provs.framework.core.ProvResult
-import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.createFileFromResource
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.createFileFromResourceTemplate
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.fileExists
 
 val loopbackFile = "/etc/netplan/99-loopback.yaml"
@@ -14,10 +14,11 @@ fun Prov.testNetworkExists(): Boolean {
 
 fun Prov.provisionNetwork() = task {
     if(!testNetworkExists()) {
-        createFileFromResource(
+        createFileFromResourceTemplate(
             loopbackFile,
             "99-loopback.yaml.template",
             resourcePath,
+            mapOf("ip" to "192.168.5.1/32"),
             "644",
             sudo = true
         )
diff --git a/src/main/resources/org/domaindrivenarchitecture/provs/infrastructure/network/99-loopback.yaml.template b/src/main/resources/org/domaindrivenarchitecture/provs/infrastructure/network/99-loopback.yaml.template
index a349685..31314d9 100644
--- a/src/main/resources/org/domaindrivenarchitecture/provs/infrastructure/network/99-loopback.yaml.template
+++ b/src/main/resources/org/domaindrivenarchitecture/provs/infrastructure/network/99-loopback.yaml.template
@@ -6,4 +6,4 @@ network:
       match:
         name: lo
       addresses:
-        - 192.168.5.1/32
+        - $ip
diff --git a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/core/UtilsKtTest.kt b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/core/UtilsKtTest.kt
index 34c8e18..70ed63a 100644
--- a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/core/UtilsKtTest.kt
+++ b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/core/UtilsKtTest.kt
@@ -66,4 +66,60 @@ internal class UtilsKtTest {
     fun test_remote() {
         assertTrue(remote("127.0.0.1", "user").cmd("echo sth").success)
     }
+
+    @Test
+    fun test_resolveTemplate_successfully() {
+        // given
+        val DOUBLE_ESCAPED_DOLLAR = "\${'\${'\$'}'}"
+        val input = """
+            line1
+            line2: ${'$'}var1
+              line3
+                line4=${'$'}var2
+              line5 with 3 dollars ${'$'}${'$'}${'$'}
+              line6${'$'}{var3}withpostfix
+              line7 with double escaped dollars ${DOUBLE_ESCAPED_DOLLAR}
+                """.trimIndent()
+
+        // when
+        val res = input.resolve(values = mapOf("var1" to "VALUE1", "var2" to "VALUE2", "var3" to "VALUE3"))
+
+        // then
+        val ESCAPED_DOLLAR = "\${'\$'}"
+        val RESULT = """
+            line1
+            line2: VALUE1
+              line3
+                line4=VALUE2
+              line5 with 3 dollars ${'$'}${'$'}${'$'}
+              line6VALUE3withpostfix
+              line7 with double escaped dollars $ESCAPED_DOLLAR
+                """.trimIndent()
+
+        assertEquals(RESULT, res)
+    }
+
+
+    @Test
+    fun test_resolveTemplate_with_invalid_data_throws_exception() {
+        // given
+        val DOUBLE_ESCAPED_DOLLAR = "\${'\${'\$'}'}"
+        val input = """
+            line1
+            line2: ${'$'}var1
+              line3
+                line4=${'$'}var2
+              line5 with 3 dollars ${'$'}${'$'}${'$'}
+              line6${'$'}{var3}withpostfix
+              line7 with double escaped dollars ${DOUBLE_ESCAPED_DOLLAR}
+                """.trimIndent()
+
+        // when
+        val e = assertThrows(IllegalArgumentException::class.java) {
+            input.resolve(values = mapOf("var1" to "VALUE1", "var2" to "VALUE2", "wrongkey" to "VALUE3"))
+        }
+
+        // then
+        assertEquals(e.message, "No value found for: var3")
+    }
 }
\ No newline at end of file
diff --git a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/extensions/server_software/standalone_server/nginx/ProvisionNginxKtTest.kt b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/extensions/server_software/standalone_server/nginx/ProvisionNginxKtTest.kt
index 70e2317..8aa8d66 100644
--- a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/extensions/server_software/standalone_server/nginx/ProvisionNginxKtTest.kt
+++ b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/extensions/server_software/standalone_server/nginx/ProvisionNginxKtTest.kt
@@ -1,13 +1,13 @@
 package org.domaindrivenarchitecture.provs.framework.extensions.server_software.standalone_server.nginx
 
-import org.domaindrivenarchitecture.provs.test.defaultTestContainer
-import org.domaindrivenarchitecture.provs.test.tags.NonCi
+import org.domaindrivenarchitecture.provs.framework.extensions.server_software.standalone_server.nginx.base.*
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.fileExists
 import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.replaceTextInFile
 import org.domaindrivenarchitecture.provs.framework.ubuntu.install.base.aptInstall
-import org.domaindrivenarchitecture.provs.framework.extensions.server_software.standalone_server.nginx.base.*
+import org.domaindrivenarchitecture.provs.test.defaultTestContainer
 import org.domaindrivenarchitecture.provs.test.tags.ContainerTest
-import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.fileExists
 import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Disabled
 import org.junit.jupiter.api.Test
 
 
@@ -15,7 +15,7 @@ internal class ProvisionNginxKtTest {
 
     @Test
     @ContainerTest
-    @NonCi
+    @Disabled  // Not running on (unprivileged ??) container
     fun provisionNginxStandAlone_customConfig() {
         // given
         val a = defaultTestContainer()
@@ -45,7 +45,7 @@ internal class ProvisionNginxKtTest {
 
     @Test
     @ContainerTest
-    @NonCi
+    @Disabled  // Not running on (unprivileged ??) container
     fun provisionNginxStandAlone_defaultConfig() {
         // given
         val a = defaultTestContainer()
@@ -61,7 +61,7 @@ internal class ProvisionNginxKtTest {
 
     @Test
     @ContainerTest
-    @NonCi
+    @Disabled  // Not running on (unprivileged ??) container
     fun provisionNginxStandAlone_sslConfig() {
         // given
         val a = defaultTestContainer()
diff --git a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/FilesystemKtTest.kt b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/FilesystemKtTest.kt
index 4952862..36e6d45 100644
--- a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/FilesystemKtTest.kt
+++ b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/filesystem/base/FilesystemKtTest.kt
@@ -207,4 +207,23 @@ internal class FilesystemKtTest {
         val content = defaultTestContainer().fileContent( "copiedFileFromLocal")
         assertEquals("resource text\n", content)
     }
+
+    @Test
+    @ContainerTest
+    fun test_fileContainsText() {
+        // given
+        defaultTestContainer().createFile("testfilecontainingtext", "abc\n- def\nefg")
+
+        // when
+        val res = defaultTestContainer().fileContainsText("testfilecontainingtext", "abc")
+        val res2 = defaultTestContainer().fileContainsText("testfilecontainingtext", "de")
+        val res3 = defaultTestContainer().fileContainsText("testfilecontainingtext", "- def")
+        val res4 = defaultTestContainer().fileContainsText("testfilecontainingtext", "xyy")
+
+        // then
+        assertTrue(res)
+        assertTrue(res2)
+        assertTrue(res3)
+        assertFalse(res4)
+    }
 }
\ No newline at end of file
diff --git a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/git/base/GitKtTest.kt b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/git/base/GitKtTest.kt
index 29fc01b..1de2758 100644
--- a/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/git/base/GitKtTest.kt
+++ b/src/test/kotlin/org/domaindrivenarchitecture/provs/framework/ubuntu/git/base/GitKtTest.kt
@@ -38,7 +38,6 @@ internal class GitKtTest {
 
         // when
         prov.trustGithub()
-        prov.gitClone("https://github.com/DomainDrivenArchitecture/dda-git-crate.git", "~/")
         val res = prov.gitClone("https://github.com/DomainDrivenArchitecture/dda-git-crate.git", "~/")
 
         // then
diff --git a/src/test/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/NetworkKtTest.kt b/src/test/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/NetworkKtTest.kt
new file mode 100644
index 0000000..14831ee
--- /dev/null
+++ b/src/test/kotlin/org/domaindrivenarchitecture/provs/server/infrastructure/NetworkKtTest.kt
@@ -0,0 +1,34 @@
+package org.domaindrivenarchitecture.provs.server.infrastructure
+
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.createDirs
+import org.domaindrivenarchitecture.provs.framework.ubuntu.filesystem.base.fileContainsText
+import org.domaindrivenarchitecture.provs.framework.ubuntu.install.base.aptInstall
+import org.domaindrivenarchitecture.provs.test.defaultTestContainer
+import org.domaindrivenarchitecture.provs.test.tags.ContainerTest
+import org.junit.jupiter.api.Test
+
+import org.junit.jupiter.api.Assertions.*
+
+internal class NetworkKtTest {
+
+    @Test
+    @ContainerTest
+    fun test_provisionNetwork() {
+        // given
+        val p = defaultTestContainer()
+        p.task {
+            aptInstall("dbus netplan.io")
+            createDirs("/etc/netplan", sudo = true)
+            cmd("/etc/init.d/dbus start", sudo = true)
+        }
+
+        // when
+        val res = p.provisionNetwork()
+
+        // then
+        // assertTrue(res.success) -- netplan is not working in an unprivileged container - see also https://askubuntu.com/questions/813588/systemctl-failed-to-connect-to-bus-docker-ubuntu16-04-container
+
+        // check file content snippet
+        assertTrue(p.fileContainsText("/etc/netplan/99-loopback.yaml", content = "- 192.168.5.1/32", sudo = true))
+    }
+}
\ No newline at end of file