Hi, I deloy hosted-engine, by this 
blog,https://ovirt.org/documentation/self-hosted/chap-Deploying_Self-Hosted_Engine/
 but I am facing some error.who  may give me  some advise?
[root@localhost ~]# hosted-engine --deploy       

          --== STORAGE CONFIGURATION ==--                   Please specify the 
storage you would like to use (glusterfs, iscsi, fc, nfs3, nfs4)[nfs3]:         
  Please specify the full shared storage connection path to use (example: 
host:/path): 192.168.122.134:/home/exports/hosted-engine                   --== 
HOST NETWORK CONFIGURATION ==--                   iptables was detected on your 
computer, do you wish setup to configure it? (Yes, No)[Yes]:           Please 
indicate a pingable gateway IP address [192.168.122.1]:           Please 
indicate a nic to set ovirtmgmt bridge on: (eth0) [eth0]:                    
--== VM CONFIGURATION ==--                   The following appliance have been 
found on your system:               [1] - The oVirt Engine Appliance image 
(OVA) - 4.1-20180124.1.el7.centos                [2] - Directly select an OVA 
file          Please select an appliance (1, 2) [1]: [ INFO  ] Verifying its 
sha1sum[ INFO  ] Checking OVF archive content (could take a few minutes 
depending on archive size)[ INFO  ] Checking OVF XML content (could take a few 
minutes depending on archive size)          Please specify the console type you 
would like to use to connect to the VM (vnc, spice) [vnc]: [ INFO  ] Detecting 
host timezone.          Would you like to use cloud-init to customize the 
appliance on the first boot (Yes, No)[Yes]?           Would you like to 
generate on-fly a cloud-init ISO image (of no-cloud type)          or do you 
have an existing one (Generate, Existing)[Generate]?           Please provide 
the FQDN you would like to use for the engine appliance.          Note: This 
will be the FQDN of the engine VM you are now going to launch,          it 
should not point to the base host or to any other existing machine.          
Engine VM FQDN: (leave it empty to skip):  []: engine.tchyp.com          Please 
provide the domain name you would like to use for the engine appliance.         
 Engine VM domain: [tchyp.com]          Automatically execute engine-setup on 
the engine appliance on first boot (Yes, No)[Yes]?           Automatically 
restart the engine VM as a monitored service after engine-setup (Yes, No)[Yes]? 
          Enter root password that will be used for the engine appliance (leave 
it empty to skip): [WARNING] Skipping appliance root password          Enter 
ssh public key for the root user that will be used for the engine appliance 
(leave it empty to skip): [WARNING] Skipping appliance root ssh public key      
    Do you want to enable ssh access for the root user (yes, no, 
without-password) [yes]: [WARNING] The oVirt engine appliance is not configured 
with a default password, please consider configuring it via cloud-init          
Please specify the size of the VM disk in GB: [58]: [WARNING] Minimum 
requirements not met by available memory: Required: 4096 MB. Available: 3064 MB 
         Please specify the memory size of the VM in MB (Defaults to maximum 
available): [3064]: [WARNING] Minimum requirements for memory size not met      
    Continue with specified memory size? (Yes, No) [No]: yes          The 
following CPU types are supported by this host:                - 
model_Haswell-noTSX: Intel Haswell-noTSX Family               - 
model_SandyBridge: Intel SandyBridge Family                   - model_Westmere: 
Intel Westmere Family                 - model_Nehalem: Intel Nehalem Family     
              - model_Penryn: Intel Penryn Family             - model_Conroe: 
Intel Conroe Family          Please specify the CPU type to be used by the VM 
[model_Haswell-noTSX]:           Please specify the number of virtual CPUs for 
the VM (Defaults to appliance OVF value): [4]:           You may specify a 
unicast MAC address for the VM or accept a randomly generated default 
[00:16:3e:5d:72:8a]:           How should the engine VM network be configured 
(DHCP, Static)[DHCP]? Static          Please enter the IP address to be used 
for the engine VM [192.168.122.2]: 192.168.122.211[ INFO  ] The engine VM will 
be configured to use 192.168.122.211/24          Please provide a 
comma-separated list (max 3) of IP addresses of domain name servers for the 
engine VM          Engine VM DNS (leave it empty to skip) [192.168.122.1]:      
     Add lines for the appliance itself and for this host to /etc/hosts on the 
engine VM?          Note: ensuring that this host could resolve the engine VM 
hostname is still up to you          (Yes, No)[No]                    --== 
HOSTED ENGINE CONFIGURATION ==--                   Enter engine admin password: 
          Confirm engine admin password:           Please provide the name of 
the SMTP server through which we will send notifications [localhost]:           
Please provide the TCP port number of the SMTP server [25]:           Please 
provide the email address from which notifications will be sent 
[root@localhost]:           Please provide a comma-separated list of email 
addresses which will get notifications [root@localhost]: [ INFO  ] Stage: Setup 
validation[WARNING] Cannot validate host name settings, reason: resolved host 
does not match any of the local addresses[ ERROR ] Host name is not valid: 
localhost.localdomain resolves to 127.0.0.1 and not all of them can be mapped 
to non loopback devices on this host[ ERROR ] Failed to execute stage 'Setup 
validation': Host name is not valid: localhost.localdomain resolves to 
127.0.0.1 and not all of them can be mapped to non loopback devices on this 
host[ INFO  ] Stage: Clean up[ INFO  ] Generating answer file 
'/var/lib/ovirt-hosted-engine-setup/answers/answers-20180404182053.conf'[ INFO  
] Stage: Pre-termination[ INFO  ] Stage: Termination[ ERROR ] Hosted Engine 
deployment failed          Log file is located at 
/var/log/ovirt-hosted-engine-setup/ovirt-hosted-engine-setup-20180404181811-aq5ord.log
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