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If the rootfs is read-only and the ssh keys are not available at system start-up, the init script will generate ssh keys into /etc/ssh, thus causing a 'read-only file system' error. In order for Yocto based image to work correctly for read-only rootfs, we use the following logic for openssh. If the rootfs is read-only and there are pre-generated keys under /etc/ssh, we use the pre-generated keys. Note the pre-generated keys are mainly for debugging or development purpose. If the rootfs is read-only and there are no pre-generated keys under /etc/ssh, we use /var/run/ssh as the location for ssh keys. That is, at system boot-up, the generated ssh keys will put into /var/run/ssh. [YOCTO #4887] (From OE-Core rev: 2ed44745024f04aa4e00ddba3009153c6b47c8e9) Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>