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author | Sverker Eriksson <sverker@erlang.org> | 2022-02-09 20:43:27 +0100 |
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committer | Sverker Eriksson <sverker@erlang.org> | 2022-02-09 20:43:27 +0100 |
commit | 6c13313ff9d4ba623745331caadcdc27a8f07ed4 (patch) | |
tree | f1044037ee0cceaab40745fb4d6169c73aa59cfe /system | |
parent | ee8a55eddef69f4e7d085feed23edb6f2cda82cf (diff) | |
parent | ceec312cf53a1d9d9bbd7fbe1946952211ac9a2c (diff) | |
download | erlang-6c13313ff9d4ba623745331caadcdc27a8f07ed4.tar.gz |
Merge branch 'maint'
Diffstat (limited to 'system')
-rw-r--r-- | system/doc/reference_manual/distributed.xml | 62 |
1 files changed, 56 insertions, 6 deletions
diff --git a/system/doc/reference_manual/distributed.xml b/system/doc/reference_manual/distributed.xml index df0c64f9ec..8361900499 100644 --- a/system/doc/reference_manual/distributed.xml +++ b/system/doc/reference_manual/distributed.xml @@ -59,14 +59,18 @@ <section> <title>Nodes</title> - <p>A <em>node</em> is an executing Erlang runtime system that has - been given a name, using the command-line flag <c>-name</c> - (long names) or <c>-sname</c> (short names).</p> + <p> + A <em>node</em> is an executing Erlang runtime system that has + been given a name, using the command-line flag + <seecom marker="erts:erl#name"><c>-name</c></seecom> (long names) or + <seecom marker="erts:erl#sname"><c>-sname</c></seecom> (short names). + </p> <p>The format of the node name is an atom <c>name@host</c>. <c>name</c> is the name given by the user. <c>host</c> is the full host name if long names are used, or the first part of - the host name if short names are used. <c>node()</c> returns - the name of the node.</p> + the host name if short names are used. Function + <seemfa marker="erts:erlang#node/0"><c>node()</c></seemfa> + returns the name of the node.</p> <p><em>Example:</em></p> <pre> % <input>erl -name dilbert</input> @@ -76,6 +80,21 @@ % <input>erl -sname dilbert</input> (dilbert@uab)1> <input>node().</input> dilbert@uab</pre> + + <p> + The node name can also be given in runtime by calling + <seemfa marker="kernel:net_kernel#start/1"><c>net_kernel:start/1</c></seemfa>. + </p> + <p><em>Example:</em></p> + <pre> +% <input>erl</input> +1> <input>node().</input> +nonode@nohost +2> <input>net_kernel:start([dilbert,shortnames]).</input> +{ok,<0.102.0>} +(dilbert@uab)3> <input>node().</input> +dilbert@uab</pre> + <note> <p>A node with a long node name cannot communicate with a node with a short node name.</p> @@ -124,7 +143,38 @@ dilbert@uab</pre> <c>nodes(connected)</c> must be used. This means, for example, that the hidden node is not added to the set of nodes that <c>global</c> is keeping track of.</p> - <p>This feature was added in Erlang 5.0/OTP R7.</p> + </section> + + <section> + <marker id="dyn_node_name"/> + <title>Dynamic Node Name</title> + <p> + If the node name is set to <em><c>undefined</c></em> the node will + be started in a special mode to be the temporary client + of another node. The node will then request a dynamic node + name from the first node it connects to. In addition these + distribution settings will be set: + </p> + <pre><seeapp marker="kernel:kernel_app#dist_listen">-dist_listen false</seeapp> <seecom marker="erts:erl#hidden">-hidden</seecom> <seeapp marker="kernel:kernel_app#dist_auto_connect">-dist_auto_connect never</seeapp></pre> + <p> + As <c>-dist_auto_connect</c> is set to <c>never</c>, + <seemfa marker="kernel:net_kernel#connect_node/1"><c>net_kernel:connect_node/1</c></seemfa> + must be called in order to setup connections. If the first established + connection is closed (which gave the node its dynamic name), then any + other connections will also be closed and the node will lose its dynamic + node name. A new call to + <seemfa marker="kernel:net_kernel#connect_node/1"><c>net_kernel:connect_node/1</c></seemfa> + can be made to get a new dynamic node name. The node name may + change if the distribution is dropped and then set up again. + </p> + <note> + <p> + The <em>dynamic node name</em> feature is supported from OTP 23. + Both the temporary client node and the first connected peer node + (supplying the dynamic node name) must be at least OTP 23 for it to + work. + </p> + </note> </section> <section> |