X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=fedoras.md;h=cab9096d732100d0e74f5484de9dd8fb9c239bed;hb=9f83389f08524569424e5b38365ce3fb131b8a6d;hp=2cdf71223b49b54added00cc4bb036e2c31dccd8;hpb=ed5ce94453595611f867aa26801094938cc690bd;p=bootcd.git

diff --git a/fedoras.md b/fedoras.md
index 2cdf712..cab9096 100644
--- a/fedoras.md
+++ b/fedoras.md
@@ -1,4 +1,38 @@
-A few notes on the status wrt recent fedoras
+A few notes on the status wrt recent fedoras. 
+
+Written in July 2016, right after my early attempts with fedora24.
 
 # `/etc/resolv.conf`
 
+A change was observed starting with fedora22, and from then on we have seen recurring issues with nodes ending up with an empty `/etc/resolv.conf`
+
+## f22
+My understanding is that at the beginning this issue was only with statically defined IPs; in that case having `DNS1` and `DNS2` defined in a `ifcfg-`*ifname* was not enough, so there was a need to populate `/etc/resolv.conf` manually
+
+## f23
+It looks like with this release, the DNS servers defined by DHCP don't make it to `/etc/resolv.conf` either
+
+## Strategy
+
+### 5.4
+
+As of 5.4, the strategy here is to
+
+ * check if the file is missing or empty
+ * and if so, we populate it with
+   * nameservers coming from `DNS1` and `DNS2` if set, 
+   * and **in all cases** with `8.8.8.8`
+
+### 5.3
+
+Note that a 5.3 bootCD would **never** add `8.8.8.8`
+
+This could result in a node **not being able to resolve its boot server IP address**. Observed first hand on `onelab1.pl.sophia.fr` and its sibling `onelab2` with a f23 bootCD.
+
+# MAC address
+
+Also with fedora23, we noticed that we sometimes have to specify the MAC address in the interface details, so that the right interface gets picked.
+
+From a lot of reading I believe this has nothing to do with `biosdevname=0` which is something. It's just that on a multi-interfaces host, the bootCD environment may pick the wrong interface, so setting the MAC address allows to work around that issue.
+
+I cannot see how to improve this for the time being.
\ No newline at end of file