1.when u
deploy your application , the server is crashed . What do u do to recover
server?
Ans:
I will check the logs to see any error messages. If the application related
errors then
I will
check for EAR files is corrupted or not. Otherwise check for WAS
System out files .
I will
redeploy the application and start the server.
2. What is the difference between HTTP and HTTPS?
HTTP is without security and HTTPS with security.
3.Tell me
some monitoring tools?
Intrascope and IBM Assistance.
4. if
single cell has 20 nodes? is it possible? Any problem this type of
configurtion?
Yes. It is possible and it supports 20 nodes.
5. How
many cells in your production?
Ans: 2
cells
6. how
to generate heap dump through wsadmin.
Invoke the generateHeapDump
operation on a JVM MBean, for example,
* Finding
JVM objectName:
<wsadmin>
set objectName [$AdminControl queryNames
WebSphere:type=JVM,process=<servername>,node=<nodename>,*]
*
Invoking the generateHeapDump operation on JVM MBean:
<wsadmin>
$AdminControl invoke $objectName generateHeapDump
7. What is
the usage of systemErr.log and systemOut.log
These gives all the error information when you want check for any application
had a issues.
8. How do
u find context root?
<PROFILE_ROOT>/<profile_NAME>/
installedApps/>CELLNAME>/<APPLICATION_NAME>/META-INF/application.xml
/u03/local/opt/was/was70/profiles/node01/installedApps/PRODUSG/usg_war.ear/META-INF/
application.xml
<module>
<web>
<web-uri>usg.war</web-uri>
<context-root>/usg</context-root>
</web>
</module>
admin
console : applicatns>websphere
enterprise applications> <application_name> Context Root For Web
Modules
9.What is
the use of plug-in?
Plugin is used for link b/w IHS server and Application
Server.
10.what is
the difference between Web server and Application Server?
A Web server exclusively handles HTTP requests, whereas an application server
serves business logic to application programs through any number of protocols.
11. are
you using IBM HTTP Server or Apache Server? What is the difference between
them?
We are using HTTP server . Both are same purpose but the product is different.
One is IBM and other one open source product.
12. . How
many Environments you are supporting.
DEV,QC,
SAT and PROD.
13. tell
me about your topology.
My
environment has 60 applications running across 20 rhel boxes with 5
cells each cell has 3 nodes under dmgr all nodes are established
horizontal cluster all cluster have 3 jvms
14. Tell
me something about clustering?
A cluster
is a set of application servers that you manage together as a way to balance
workload.
Horizontal
clustering
Horizontal
clustering, sometimes referred to as scaling out, is adding physical machines
to increase the performance or capacity of a cluster pool. Typically,
horizontal scaling increases the availability of the clustered application at
the cost of increased maintenance. Horizontal clustering can add capacity and
increased throughput to a clustered application; use this type of clustering in
most instances.
Vertical
clustering
Vertical
clustering, sometimes referred to as scaling up, is adding WebSphere
Application Server instances to the same machine. Vertical scaling is useful
for taking advantage of unused resources in large SMP servers. You can use
vertical clustering to create multiple JVM processes that, together, can use
all of the available processing power.
15. Tell
me about yourself?
My name is KUMAR I am
Currently working as SOFTWARE ENGINEER OR WAS ADMINISTRATOR in IBM from APRIL
2009.
As a WAS
ADMINISTRATOR My Roles and Responsibilities are
Exprience
in Deploying EAR , JAR , WAR files.
Federated
multiple nodes to DMGR
Experience
in setting up of nodes , Data Sources , Virtual Hosts
Implemented
when using Horizontal and Vertical Clusters.
Configured
enabled Global Security system.
Configured
Web Sphere resources like JDBC PROVIDERS , JDBC DATA SOURCES , CONNECTION
POOLING.
Responsible
for general WAS ADMIN tasks like Starting and Stopping of Servers.
16.Explain
the installation of ND?
17.How to
create profiles (Explain)?
Ans)by
using Manageproiles.sh and pmt tool
18. Difference
b/w 6.1 and 7.0?
Changes in v7.0
Administration
changes
–
SessionInitiationProtocol(SIP) Migration Considerations
– zOS
Migration tool
–
Administration script required changes
– Port
usage
–
Security Migration considerations
– Mixed
version considerations
Development
changes
–
Development tool change
– JRE 6
impacts
– JEE 5
impacts
–
WebSphere removed features
–
Increased usage of Open Source implementations included in WAS
19. Which
tool your are using for WAS?
wily
introscope monitoring tool
20. Which
server your using for WAS(HTTP or Apache)?
HTTPSERVER
21. What are your daily
tasks?
ans)
Monitor the applications and check health status of SERVERS
and we
are using ticketing tool based on tickets i will do my work and finally i
update my work log.
22. What
you did yesterday(explain about your yesterday task)?
ans)
yesterday i had 4 tickets so i did my tickets works
23. How to
apply packs ?
Through
update installer
1. first
take backup the configuration files and down all process's
2. copy
the packs to maintains directory under UpdateInstaller
3.run
update.sh and select environment (was/ihs/plugins) as your requirement
4. start
process's
24. How to
federate Node to Dmgr?
by using
addNode.sh
25. What
are use of packs?
to fix
the specific issues and add miner new features
26. what
is the use of addNode.sh and syncNode.sh?
by using
addNode.sh to federate the custumprofile to DMGR
By using
syncNode.sh to synchronize the master repository to local repository
27. Diff
b/w Profile and Node?
Profiles:
set of files to provide the runtime environment
Nodes:
logical unit that build of nodeagent and one or more servers .
28 . How to solve
thread dump issues?
Bounce
the servers
29. How to
solve heap dump issues using heap dump analyzer?
Increase
the heap size for temporary purpose.
and find
the root cause of out of memory or memory leaks then discuss with
developers for changing code
30. What
does plunging contain?
plugin
has set of files.
The
primary responsibility of the plug-in is to forward HTTP requests from the Web
server to the WebSphere Application Server.
31.
Command to invoke heap dump analyzer?
kill -3
<processID>
32. Types
of algorithms in workload management?
1. Random
2. Round
Robin
33. Session Affinity?
Session
affinity overrides the load-balancing algorithm by directing all requests in a
session to a specific application server.
34. How many ways we will
create profiles? what are they?
2
ways
1.
command line( MANAGEPROFILES.SH)
2.
Profile management tool (PMT)
35. What
is SSL?
Secure
socket layer its just a protocols
SSL
protocol for transmitting data securely over the World Wide Web is Secure HTTP
(S-HTTP).
36. what is heap dump analyst ?
ibm
memory analyzer
37. how to take thread dump?
kill -3 <server process id>
and jython script
38. How
many types of profiles? what are they?
5 types there are 1. cell 2. application server 3. Deployment
Manage (DMGR)
4. custom profiles 5. proxy profiles
39. What are config files?
all xml files are config files
40. How to do silent installation?
Extract the installer
Create a responsefile.base.txt as per your requirement
content.
Install with the following options
./install –options responsefile.base.txt -silent
41. What
is 505 error how to handle it?
The Web server (running the Web site) does not support, or
refuses to support, the HTTP protocol version specified by the client (e.g.
your Web browser or our CheckUpDown robot) in the HTTP request data stream
sent.
The HTTP protocol has various versions identified as major.
minor e.g. version 0.9, 1.0 or 1.1. The server is indicating that it is unable
or unwilling to complete the request using the major version provided by the
client - other than with this error message.
Assuming that your request identifies a valid major. minor
version number (the request is not fundamentally corrupt), then this error
should mostly only occur if you are trying to use version 1.0 or 1.1, but the
Web server only supports the older 0.9 version.
Fixing 505 errors - general
Most Web browsers assume that Web servers support 1.x
versions of the HTTP protocol. In practice very old versions such as 0.9 are
little used nowadays, not least because they provide poorer security and performance
than newer versions of the protocol. So if you see this error in your Web
browser, the only option is to upgrade the Web server software. If version 1.x
requests fail, it may well be because the Web server is supporting the 1.x
protocol versions badly, rather than not supporting them at all.
42. What is
404 error how to handle it?(file not found )
The server could not find the file that the visitor
requested. This error commonly occurs when a URL is mistyped.
check the sysemout.log and check the status of server and
check url
check webserver logs files
43. What
is the log files of a plug-in?
http_plugin
: we can check plug-in related issues.
IHS logs.
a)
Access.log. If a request is reaching to web server or not.
b)
Error.log. <HIS-root>/logs
c)
Adminerror.log. If the web server is on remote box at that time we will get
logs.
44. What
is the memory space of DMGR?
Ans: 35
Mb
45 . What
is global security?
Global
security can be enabled for application servers running within a cell so that
authentication is required, requesting that a valid user ID and password is
entered before an application server can be accessed.
46. If any
changes made in admin console ,in what user role we have to do in real-time?
Configurator role
47. What
is the size of connection pool?
To view this administrative console page, click
Resources > JDBC Providers > JDBC_provider > Data
Sources > data_source > Connection Pool.
48. What
is j2c?
J2EE
Connector architecture (J2C) authentication alias can be used to provide the
credentials required for access to systems like Databases, Queue Manager (MQ),
Mail providers,....is a way to configure a user/password in Websphere and then
link with the connector (datasource, connection factory,....)
49. What
is the responsibilities when your restart a server?
operator
50. why
your using plug-in?
plug-in
provide workload management and failover
and
routing request away from a failed application server
51. Can
you tell me ,what issues you troubleshooting?
http 500
, http 404 , 403
memory
leaks
out of
memory
hang the
servers
52. What
are the heapdump thread dump analyzer?
IBM Thread and
Monitor Dump Analyzer
ibm
memory analyzer
53. What
is the responsibilities of monitor?
An
individual or group that uses the monitor role has the least amount of
privileges. A monitor can complete the following tasks:
- View the
WebSphere Application Server configuration.
- View the current
state of the Application Server.
54. What
is the responsibilities of operator?
An
individual or group that uses the operator role has monitor privileges plus
ability to change the runtime state. For example, an operator can complete the
following tasks:
- Stop and start
the server.
- Monitor the
server status in the administrative console.
55. why
we need personal signed certificate ( by certificate signing authority ) and
not self signed certificate ?
selfsigned certificates are not
trusted by other components /browser while handshaking . It is likely to throw not
secured site / handshake error / cross mark symbol on https sign in browsers.
One should only use selfsigned certificates in intranet, not suggested to use
in real world
signed certificate: used in
Internet
56. How
plug-in is communicated with back end application server by using ssl ?say yes
if there is any process?
In general if SSL is enabled
between browser (read LB) and webserver you can bypass the SSL configuration
between webserver plug-in and application server .In WAS 6.X and 7.X by default
non secure port will be used if plugin.kdb path is not set . But its highly
recommended to enable SSL between webserver plug-in and application server if
application is critical and is exposed to internet . It can be achieved by
using exiting /creating plugin.kdb . In addition to this plugin-key.kdb must
include the cell’s root signer certificates and the web server plug-in
certificate must be added in the CellDefaultTrustStore to SSl properly to work
between plug-in and application server . For any particular application to use
the SSL between plug-in to application JVM one can enable client authentication
in webcontainer service transport tab.
57.Why
we need to use more intermediate certificate then root certificates?
The more components you connect ,
the more intermediate cert is required to be added in signer trust
58. How
webserver does know the firewall is getting request?
simple telnet from source to destination on
port . check for logs it will also give information's.
59.What
kind of keystore are using apart from PKCS from websphere?
JKS ,BKS
60.Which
command to check the fixpack are applied or not ?
versioninfo.sh in WAS installed
bin directory .
./versioninfo.sh -long
61.We
want to send directly request from LB to WAS?what are steps you are fallowing
in WAS level?
Yes it can be done. There are several
ways to do it . One of the common is using firewall ( assigning public IP
addresses on the firewall) acts as a proactive layer and using dynamic outbound
at console by enabling SSL over specific port .
62.Which
command to check OS performance in linux/aix?
Top, topas, nmon , vmstat , lsof,
nice & nmon
63. There
are 3 difference Horizontal clusters(C1-20,C2-20,C3-20) in the WAS & all
cluster weights are same & up and running as well. How do we know which
cluster is receiving first request ?
The JSESSIONID has mainly 3 information's
cacheID , Session Id , clone ID /partition id . To know which cluster member is
serving the request one need to check clone Id . but when Memory to memory
replication is used check for Partition IDs rather than Clone IDs.
64. what
are default port for FTP/SSH/LDAP/DNS?
FTP: Default port 21
SSH: Default Port 22
LDAP: Default Port 389/ 636
DNS: Default Port 80/443
