b18dba3794
iSCSI target (=the server) is implemented in Linux kernel. The "iSCSI server" pod is not a real server, it just configures the kernel on the host. In order to run iSCSI tests in parallel, we need to be able to run multiple such pods on a single node, serving different LUNs to different tests. The "server pod" must run with HostNetwork=true to achieve that. Each pod then creates its own IQN with namespace name, so it can't collide with other server pods running in another namespaces on the same node.
73 lines
2.3 KiB
Bash
Executable File
73 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright 2018 The Kubernetes Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This script does not run any daemon, it only configures iSCSI target (=server)
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# in kernel. It is possible to run this script multiple times on a single
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# node, each run will create its own IQN and LUN.
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# Kubernetes must provide unique name.
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IQN=$1
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# targetcli synchronizes over dbus, however it does not work in
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# containers. Use flock instead
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LOCK=/srv/iscsi/targetcli.lock
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function start()
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{
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# targetcli need dbus. It may not run on the host, so start a private one
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mkdir /run/dbus
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dbus-daemon --system
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# Create new IQN (iSCSI Qualified Name)
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flock $LOCK targetcli /iscsi create "$IQN"
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# Run it in demo mode, i.e. no authentication
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flock $LOCK targetcli /iscsi/"$IQN"/tpg1 set attribute authentication=0 demo_mode_write_protect=0 generate_node_acls=1 cache_dynamic_acls=1
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# Create unique "block volume" (i.e. flat file) on the *host*.
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# Having it in the container confuses kernel from some reason
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# and it's not able to server multiple LUNs from different
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# containers.
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# /srv/iscsi must be bind-mount from the host.
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cp /block /srv/iscsi/"$IQN"
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# Make the block volume available through our IQN as LUN 0
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flock $LOCK targetcli /backstores/fileio create block-"$IQN" /srv/iscsi/"$IQN"
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flock $LOCK targetcli /iscsi/"$IQN"/tpg1/luns create /backstores/fileio/block-"$IQN"
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echo "iscsi target started"
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}
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function stop()
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{
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echo "stopping iscsi target"
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# Remove IQN
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flock $LOCK targetcli /iscsi/"$IQN"/tpg1/luns/ delete 0
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flock $LOCK targetcli /iscsi delete "$IQN"
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# Remove block device mapping
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flock $LOCK targetcli /backstores/fileio delete block-"$IQN"
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/bin/rm -f /srv/iscsi/"$IQN"
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echo "iscsi target stopped"
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exit 0
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}
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trap stop TERM
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start
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while true; do
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sleep 1
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done
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